I don't thing RP ever claimed it was wrong to obey Jesus,...any follower of Jesus would obviously honor, respect and DO as he instructs. Not rocket science,...unless one believes they don't have to follow Jesus commandments, explaining for some doctrinal reason why they are exempt from doing so. Some 'dispensationalize' everything, so that Jesus teachings were only for those before Paul's gospel of grace came along, so you can cherry-pick his words, which apply,...lest you fall under the old law
It remains true that faith without works is dead. Faith is essential, yes...and this is were many choose to stay with a 'theoritical' assumption of faith, ...that it is all you need. Much of this faith is only in some 'positional' stance, more of an intellectual concept of 'faith',....and this seems sufficient, but of course a true and living faith is much more, having a dynamic that effects ACTION and produces good works, naturally....since living faith inspires one to DO God's will, to fulfill itself by obeying the Spirit of God. These things are fundamental,...so much of the debate is but in subtle details, semantics, presuppositions, technical nuances, etc.
Faith if allowed to fully fulfill itself in God, will bear its full fruit, unto salvation. - this obviously includes full hearted devotion and loyalty to DO God's will.