If this were really true then the Holy Spirit would not have said (through David) regarding Scripture: The LAW OF THE LORD IS PERFECT converting the soul (Ps 19:7).
Both the Old and the New Covenants have laws, injunctions, and commandments. But Christians are being fed a false Gospel and a false concept of Legalism, by people who should know better. It is one thing to falsely believe that one can be justified by the works of the Law. It is quite another thing to promote the false idea that Christians do not need rules, regulations, laws, and standards based upon God's requirement for them to be holy. While we depend upon the Holy Spirit to make us holy, the Holy Spirit Himself tells us to live soberly, righteously, and godly in this present world (Titus 2:12). So we examine the things of this world -- ungodliness and worldly lusts -- and determine to avoid them, as well as the works of darkness.
Ok,maybe you didn't notice you left out any position of grace in your post.
The points you make about legalism are partial truths.
Legalism can be subtle. It thrives in mans heart.it is incubated outside of grace. A legalist is unaware of it's influence.
But someone grace centered is repeled immidiately by that dogma.
What happens is, the legalist has installed in himself a default mode. It is performance DRIVEN. Performance, mainly of others.
Correction is the mainstay. Performance correction.
So,what is NT default mode? Love. Basically, the gifts in operation.
IOW, if left to itself,the christian believer will most likely gravitate the wrong way.
Enter the HOLY SPIRIT.
The bible says,"the letter killeth,but the spirit gives life".
The antidote to legalism is the baptism of the Holy Spirit.
You think legalism is confined to the Law?
Think again. Peter had to be rebuked openly over circumcision. Yes a Jewish ordinance policeman.
A christian legalist is a christian policeman.
.....all about performance.
If performance is your banner, yep you are indeed a legalist.