I think people make a bigger deal of this than it truly is. Do you have to put in a little bit of work to get decent results with TDA?
Yes.
Is it an insurmountable problem for people who aren't going to put in thousands upon thousands of hours of training and become A class or higher?
Speaking as a sample size of one, I'd say no - I'm only at the upper end of C class in Production. (I've had a few classifier scores that have crept into B class territory, but to date, never enough in a row to actually get me out of C.) I get good hits with a TDA pistol out of the holster roughly X times/match where X is the number of stages, and that was true even when I was a U and then a D. I did a decent amount of dry DA presses/wall drill early on in order to get used to how the trigger worked, but beyond that, nothing special.
TDA is not rocket surgery - it's just learning to pull the trigger straight back without disturbing the sights too much...or, you know, learning to shoot a pistol. Much like every a manual transmission car's clutch is a little bit different from every other one, every trigger is a little bit different, right? I would be willing to bet that if we spent an hour on the range together with you shooting my P99 and me shooting one of your Glocks, we'd both be able to at least be baseline competent by the end of the hour. (I have never live fired a Glock, and have only dry fired one or two of them briefly.) The trouble is that we'd have to do everything from the low ready because you're wrong-handed so none of the holsters would transfer. Well, that and you're in FL.