I would even argue that an individuals ideal squat will vary over the years based on how their musculature changes as they progress.

Exactly. Things will doubtless change as you get stronger, and gain experience. The point of learning basic techniques is that they are a good starting point for beginners. So those athletes have perfected what works best for them at a huge weight. That does not mean that basic techniques like spine neutrality should be thrown out for beginners. Spine neutrality is a good thing for beginners because it ensures safety. Mark Rippetoe, and myself, believe that it also helps hip drive. This is a good habit to get into when learning technique. But yes, of course, this may change as you get stronger, and that's okay. Nothing you have said really conflicts with what I believe, up until this point.

That said, there is no reason not to try to emmulate the technique of the people who are the very best at something.

There are a million reasons why you shouldn't put the same weight on your back as those guys can. Can you squat 1000 pounds? No? Well why would you bother trying to squat 200 pounds the same exact way someone squatting 1000 pounds does. So yes, there are, arguable, a few reasons to not try to replicate the technique of someone lifting 1000 pounds.

so why would I suggest that a beginner develops a technique that I know is unlikely to serve them well as they get stronger?

And here you make it obvious how hard you're trying to force this narrative.

Go watch the video I posted. Do the experiment he does. Have someone press down on your lower back while you look at the ceiling and try to push your butt up. Then do it with your spine straight/head alighed with your body. Was it easier to press against your friends weight with your head up or neutral? The answer is that it's easier with your spine straight and aligned. This is something you can do yourself and it's true, this is a fact, and it's a fact because you can go do the experiement yourself and get the same results. So if you you're able to drive your hips up with more power while your spine is straight, how you could possibly make the assertion that you actually fucking know what is unlikely to help someone?

The only thing you know is that you're right, and you're hellbent on showing me that you're wrong. I'm trying to bring you into the middle ground but you seem to want to speak in absolutes.

To clarify, beginners should often follow a certain scheme of technique.

Does that mean that the techniques talked about here are perfect and gauranteed to be perfect for everyone? Of course not.

Does that mean that I'm saying powerlifters are doing it wrong? Of course not

As a beginner and someone still learning, you try this, you try that. You keep doing what works, you change what doesn't. If this technique doesn't work for you, then that's great! That doesn't mean it's wrong!