I think the basic problem with misunderstandings related to obedience center on union with Christ.
Those who are greasy gracers only acknowledge legal union, meaning that they believe that Jesus' righteousness has been legally imputed to the believer. But, they deny that believers are united with Christ in a vital union that produces good works.
Legalists often think that they produce works by their own resources, and not through their vital union with Christ. Some of them even deny legal righteousness.
But, Reformed people have the best balance..they acknowledge legal union, but also acknowledge vital union that transforms them through their union with Christ. They are attached to the vine, and they DO produce fruit as a result.
So many are hung up on simple legal union with Christ, and not vital union with Christ. They are like a half-baked cake.