We still need to deal with our flesh by grace.
Yes, the true grace of the Lord empowers us with His Spirit so we control our flesh rather than making excuses for our flesh controlling us resulting in walking after the flesh in sin. Remember, it's by the Holy Spirit that we reign in life through Jesus and His Word.
Titus 2:11,12 - For the grace of God that bringeth salvation hath appeared to all men,
Teaching us that, denying ungodliness and worldly lusts, we should live soberly, righteously, and godly, in this present world
I didn't say anything that can or would be done apart from the true grace of the Lord.
But, those walking in fake grace will claim I'm saying to do things apart from the Lord.
Philippians 4:13 - I can do all things through Christ which strengtheneth me.
Notice the "through Christ" part there?
Why should we even need self-control?
Amazing question. Because the fruit of the Spirit is the attributes of the Lord present in the Holy Spirit that should be in all of us
Galatians 5:22–23 says the fruit of the Spirit is love, joy, peace, forbearance, kindness, goodness, faithfulness, gentleness, and self-control.
Proverbs 4:23 - Keep thy heart with all diligence; for out of it are the issues of life.
We still have a body of corruption working against us.
No, those who do not accept the whole counsel of God are taught nothing can be done about the flesh and they cannot control the urges of the flesh which is why they are so sin friendly and cannot cease from sin. They've been taught wrong. The certainly don't believe and walk in Romans 8:11-14 or Galatians 5:16
Galatians 5:16 - This I say then, Walk in the Spirit, and ye shall not fulfil the lust of the flesh.
Romans 8:11-14
But if the Spirit of him that raised up Jesus from the dead dwell in you,
he that raised up Christ from the dead shall also quicken your mortal bodies by his Spirit that dwelleth in you.
Therefore, brethren, we are debtors, not to the flesh, to live after the flesh.
For if ye live after the flesh, ye shall die: but if ye through the Spirit do mortify the deeds of the body, ye shall live.
For as many as are led by the Spirit of God, they are the sons of God.
They need to start believing and walking in these passages as well:
Ephesians 4:22-24 - put off concerning the former conversation the old man, which is corrupt according to the deceitful lusts;
And be renewed in the spirit of your mind; And that ye put on the new man, which after God is created in righteousness and true holiness.
Romans 13:14 - put ye on the Lord Jesus Christ, and make not provision for the flesh, to fulfil the lusts thereof.
Colossians 3:10 - And have put on the new man, which is renewed in knowledge after the image of Him that created Him:
Telling the Lord on judgement day that the flesh could not be controlled and there was no way to cease from sin ain't gonna cut the mustard