It's not theoretical, it is the way. And I've never said that that the law isn't useful for edification, as James used it. But I do say that it is a poor substitute for following the spirit. The church has tried the law approach for ages, and I'm not impressed.
I know of no worldly "church" that even tries to follow His Law as written and inteneded...
but to me the Law is the way to confirm the right Spirit is guiding, His Spirit would never guide outside what His Instructions are.