I am far from an expert on any of this but I can't see how it would slow the learning curve although the amount of help you get from it could be questioned. Left/right hand coordination could be boosted somewhat, I guess.

I am barely getting started myself after begin around an amateur bluegrass band while growing up. But GH had a role in re-energizing my interest. Once I get started I plan to try using GH, with some cheat codes, to create a backing track. I know there is a no-fail cheat. With that and the crowd volume turned down, backing tracks should be easy to record. Playing along with them will be a different story.