Yep, some bows are designed in such a way that it makes it more difficult for the shooter to mess up a shot but when all is said and done, it's the shooter that either messes it up or not.
The bow itself is as accurate as the shooter allows it to be...or not. Speed has nothing to do with it.
Think about this for a minute. Let's assume I have a bow, say a Black Widow, that fits me like a glove, the grip is perfect, brace height is just where I want it, draws smooth and I am accurate as can be with it. I mean I can absolutely drive tacks with this thing. I'm shooting an arrow that is 10 gpp at 183 fps. Let me take the same bow, same grip, same brace height, same string, silencers, everything is the same except for the fact that I am now using an arrow that is 8 gpp and traveling at 206 fps. Will this bow all of a sudden become inaccurate now that it's "fast?"
It's going to do what it's going to do, fast, slow or somewhere in between...unless of course I screw it up.