I agree. However, our focus should be on those old commandments. We are a new creation, under a new covenant, with new commandments. John 13:34, 1 Cor 7:10 (which differs from the OT), 1 Thess 4:1-8, 1 JOhn 3:23, etc.
America has many laws which have their foundation in English law, but we are no longer under English law. In the same manner, New Testament commandments have their foundation in OT commandsm, but we are no longer under OT law.
I disagree. The 10 commandments are the objective benchmark, our school master, our tutor, the laws that tell us how we're doing in our spiritual growth. The two greatest commandments by Christ:
Mat 22:37 Jesus said unto him, Thou shalt love the Lord thy God with all thy heart, and with all thy soul, and with all thy mind. Mat 22:38 This is the first and great commandment.
Mat 22:39 And the second [is] like unto it, Thou shalt love thy neighbour as thyself.
Mat 22:40 On these two commandments hang all the law and the prophets.
The first four commandments define love of God, the last 6 love of fellow man.
I do believe that you're correct in that physically trying to keep these commandments without spiritually living them isn't profitable. In that case we're just like the Pharisees, supposdely clean and righteous on the outside, but inwardly full of rot.
Mat 23:27 Woe unto you, scribes and Pharisees, hypocrites! for ye are like unto whited sepulchres, which indeed appear beautiful outward, but are within full of dead [men's] bones, and of all uncleanness.
Mat 23:28 Even so ye also outwardly appear righteous unto men, but within ye are full of hypocrisy and iniquity.