I have intermittently been thinking about this topic for a while, but in the last day I have listened to part of a PTSG podcast and read a post on Enos that brought this front and center. The question being are you trying to shoot well or learn to be a good shooter.
On PSTG, Stoeger said with a heavy gun like a CZ Shadow 2, you can get a crappy grip and still shoot alphas. With a Glock, that same grip results in a C or D.
Someone on Enos posted the following:
I am all about picking the tool that allows you to better in games, but I don't think you should give up your fundamentals and ability to shoot an "unforgiving" gun like a Glock.