We likely won't ever come to any conclusions. I'm glad for the debate and I wanted to bring out the discussion formally as I'm sure it will come up the next time someone asks about their first pistol, or wants to know how to improve their minute-of-washtub groups (TDC, MOW has become part of my lexicon now...thanks).
I think that first pistol threads focus too much on fit. That's completely subjective. What's important information for the first time buyer if how easy it is to come by spare parts. Is there a history of guide rods snapping? Should you be looking for gen 1 or gen 2? The last thing I want to do now is tell someone that they should buy a CZ cause it 'fits my hand perfectly'.
For a first time buyer, the reason it's important the person gets a handgun that fits their hand and natural body mechanics is important is that it will make using the handgun more fun and intuitive, so it encourages practice and helps maintain interest. Feeling like you're struggling against equipment you're supposed to be learning to use will reduce interest in the activity. Remember, not everybody gets into pistol shooting with aspirations to be Bullseye champions or break IPSC records, but if they like casual target shooting and find it rewarding, those interests are a lot more likely to develop.
I got to experience this whole affair firsthand with my wife. She didn't like shooting handguns at all until she found one that fit her hand because it was just a frustrating experience with virtually no reward. Once she found a handgun she liked the feel of, it's night and day. Her handgun is now her favourite of all, unseating even the beloved BLR. The difference was entirely in finding a comfortable gun. She is now looking into her Black Badge, something neither of us ever expected to happen.
The reason fit is important to emphasize to new shooters is exactly because of the subjectivity. It's an intangible so it can be easy to lose track of when the person hasn't spent a lot of time shooting. They're trying to wade through a flood of marketing garbage, kool-aid drinkers on forums, and gunshop salesmen hyping up features and model numbers, especially on the first handgun purchase. With advice like "my CZ fits my hand perfectly so you should buy one too", I would hope somebody can take that for what it is--a suggestion at best and a post-count bump at worst.
I've never seen genuine fit
versus fundamentals discussion or advocacy. Maybe it's happened somewhere, but I'd hope that kind of advice ("don't worry about practice, just get a gun that fits your hand") would be delegated to the same pile as "try shooting with the gun pointing backwards for a good laugh". It's obviously bad advice. The two aren't exclusive. A better fitting gun just makes the whole experience of shooting more fun, intuitive, and easier. This is especially true if you're doing any kind of action shooting. I have shot IPSC courses with other people's handguns of various makes and it's not like guns I find less ergonomically pleasant make my hands melt, but the courses are a lot easier and more fun with the guns that fit me naturally.
When I buy a handgun, it's something I will be holding for hundreds of hours between practice dry, range practice, and matches. I'm also going to be effectively throwing
thousands of dollars through it. I think it's well worth the sacrifice to have people think I'm a tool while I spend twenty minutes at the gun store counter groping a potential thousand-dollar plus purchase, much less one that's going to see so much use. If anything, I think it's crazy to not to try and take a gun for the most thorough test spin you can afford to. While it's true there's some level of compromise to be made unless you have a gun custom-built for you, but why sacrifice more comfort than you need to?
It's too bad that so many people don't have access to a large pistol shooting community where they live or gunstores that will let them toy with various makes and have to blindly order off the internet. Unfortunately, they're kind of stuck with the trial-and-error process, and I imagine that process can get pretty expensive.