It isn’t shocking seems to me, more like common sense to avoid a doomed to failure legal relationship based on my own ability to obey God, in favor of receiving a gracious one that pleases God and ends with perfect results pleasing to God.
Deuteronomy 27:1 And Moses with the elders of Israel commanded the people, saying, Keep all the commandments which I command you this day.
The beginning of the legal agreement.
Deuteronomy 27:9 And Moses and the priests the Levites spake unto all Israel, saying, Take heed, and hearken, O Israel; this day thou art become the people of the LORD thy God.
10 Thou shalt therefore obey the voice of the LORD thy God, and do his commandments and his statutes, which I command thee this day.
The Israelites were commanded to obey and do all.
Deuteronomy 27:11 And Moses charged the people the same day, saying,
12 These shall stand upon mount Gerizim to bless the people, when ye are come over Jordan; Simeon, and Levi, and Judah, and Issachar, and Joseph, and Benjamin:
13 And these shall stand upon mount Ebal to curse; Reuben, Gad, and Asher, and Zebulun, Dan, and Naphtali,
Half of Israel commanded to stand as witness and to bless, half to curse immediate upon having entered the promised land.
Deuteronomy 28:1 And it shall come to pass, if thou shalt hearken diligently unto the voice of the LORD thy God, to observe and to do all his commandments which I command thee this day, that the LORD thy God will set thee on high above all nations of the earth:
2 And all these blessings shall come on thee, and overtake thee, if thou shalt hearken unto the voice of the LORD thy God.
They will only be blessed if they hearken, and observe to do, all the commandments.
Deuteronomy 27:14 And the Levites shall speak, and say unto all the men of Israel with a loud voice,
The priests proclaim loudly 12 curses that are legally amened. As in “So be it.”
Deuteronomy 28:1 And it shall come to pass, if thou shalt hearken diligently unto the voice of the LORD thy God, to observe and to do all his commandments which I command thee this day, that the LORD thy God will set thee on high above all nations of the earth:
2 And all these blessings shall come on thee, and overtake thee, if thou shalt hearken unto the voice of the LORD thy God.
Only happens if the Israelites observe and do all the commandments.
Followed by 4 blessings and four curses.
Followed by tremendous threats if they fail to observe and do all.
Deuteronomy 28:58 If thou wilt not observe to do all the words of this law that are written in this book, that thou mayest fear this glorious and fearful name, THE LORD THY GOD
Followed by more threats.
Deuteronomy 29:1 These are the words of the covenant, which the LORD commanded Moses to make with the children of Israel in the land of Moab, beside the covenant which he made with them in Horeb.
Deuteronomy 29:10 Ye stand this day all of you before the LORD your God; your captains of your tribes, your elders, and your officers, with all the men of Israel,
11 Your little ones, your wives, and thy stranger that is in thy camp, from the hewer of thy wood unto the drawer of thy water:
12 That thou shouldest enter into covenant with the LORD thy God, and into his oath, which the LORD thy God maketh with thee this day:
Everyone was involved.
Deuteronomy 31:15 And the LORD appeared in the tabernacle in a pillar of a cloud: and the pillar of the cloud stood over the door of the tabernacle.
16 And the LORD said unto Moses, Behold, thou shalt sleep with thy fathers; and this people will rise up, and go a whoring after the gods of the strangers of the land, whither they go to be among them, and will forsake me, and break my covenant which I have made with them.
The Lord knew they would break the covenant.
Deuteronomy 31:24 And it came to pass, when Moses had made an end of writing the words of this law in a book, until they were finished,
25 That Moses commanded the Levites, which bare the ark of the covenant of the LORD, saying,
26 Take this book of the law, and put it in the side of the ark of the covenant of the LORD your God, that it may be there for a witness against thee.
27 For I know thy rebellion, and thy stiff neck: behold, while I am yet alive with you this day, ye have been rebellious against the LORD; and how much more after my death?
28 Gather unto me all the elders of your tribes, and your officers, that I may speak these words in their ears, and call heaven and earth to record against them.
29 For I know that after my death ye will utterly corrupt yourselves, and turn aside from the way which I have commanded you; and evil will befall you in the latter days; because ye will do evil in the sight of the LORD, to provoke him to anger through the work of your hands.
30 And Moses spake in the ears of all the congregation of Israel the words of this song, until they were ended.
So, the question in my mind is...
Why did the Israelites sign on?
They had confidence in the flesh.
Compare that to what Jesus taught as the blessings of the new covenant...
Matthew 5:2-12
And he opened his mouth, and taught them, saying,
Blessed are the poor in spirit: for theirs is the kingdom of heaven.
Blessed are they that mourn: for they shall be comforted.
Blessed are the meek: for they shall inherit the earth.
Blessed are they which do hunger and thirst after righteousness: for they shall be filled.
Blessed are the merciful: for they shall obtain mercy.
Blessed are the pure in heart: for they shall see God.
Blessed are the peacemakers: for they shall be called the children of God.
Blessed are they which are persecuted for righteousness' sake: for theirs is the kingdom of heaven.
Blessed are ye, when men shall revile you, and persecute you, and shall say all manner of evil against you falsely, for my sake.
Rejoice, and be exceeding glad: for great is your reward in heaven: for so persecuted they the prophets which were before you.
The new covenant resting on faith in Jesus who works in us to will and to do whatever is pleasing to God. No limiting commandments as letter but a living walk with Jesus in the light as he walks.