Any believer who desires to be under the law is perfectly free to do so. Lots a luck! I never seemed able to keep it. But maybe you can do it better than me. On the other hand, keeping the law requires perfection, so just doing it better than me won’t cut it.
We are not under the law, but under Christ, the Creator of the law. However, that doesn’t mean that the Creator of the law has abandoned the principles of government and behavior which the law describes. It is precisely because these laws (principles) could not be abandoned that made it necessary for God’s Son to take the penalty of transgression in Himself in order for there to be any path of redemption available to fallen man.
Adventists don’t expect to keep the law perfectly either, for we are sinful and corruptable creatures. We are all dependent upon Christ to have kept the law for us and the cover our sin with His righteousness.
Our attempt to keep it is simply the acknowledgement that it is still valid.
You don’t throw it out because you can’t keep it perfectly.
Do you want to try arguing that traffic laws should be done away with, because you can’t help but get the occasional speeding ticket?