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(FrankenMauser might want to contribute)
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I tend to agree with your opinion.
In my experience and opinion, it is priming and rim support that are most important in the rimfire world.
Pretty much everyone (except Winchester and Remington) have powder charges *really* dialed-in for everything but bulk ammo, and they're consistent to roughly less than 3 milligram. (Which, I believe, is less than 0.05 gr?) (And much of the bulk ammo reliability issues seem to come back to cracked or broken priming compound from rough handling - but that is another discussion.)
As long as you have good rim support (which may require good headspace) and are shooting a quality brand with good priming, .22 LR should do well.
I have not previously considered chamber sealing, so I am hesitant to offer an opinion on that yet. I need to think about what I have seen; and, perhaps, solicit some valued opinions. But with a surface-level pass, I don't think that theory is reasonable.
That being said: I have seen and experienced the difference between "Match", "Bentz", and "Sporting" chambers.
It really does matter.
Sure, some people get 'Sporting' chambers that shoot really well, I am currently shooting a Bentz chamber in some matches (NRL22 with a Marlin 880SQ), and that same Bentz chamber got a class win in my last match. But, overall, it seems that the tighter you can get the chamber, the better any .22 LR will shoot. --If you have good rim support! Without good rim support, it doesn't matter what chamber you have. Performance will be erratic without good rim support.