Agree with all of that, but I'd add one caveat: call it the Belichick Factor.
Belichick is, in my opinion, the finest defensive game planner in the history of the game (among other things) and it's because he can reconfigure his defense to seize the initiative and dictate an offense right off whatever plan they had coming in. He does it via a really odd mix of flexibility and discipline; it's predicated on taking away your best option(s) and refusing to get spooked off whatever it is he wants to do, but he's willing to be endlessly flexible in how he gets there...no idea is too crazy if it works, but once he finds it, you can't confuse him out of it.
The way the playoffs worked out last year, we had a chance to see both philosophies tested against that approach back-to-back. NE absolutely stonewalled KC through the first half, but KC was still able to make up all that ground and force OT in the second half. In the Super Bowl, LA's offense never did end up proving effective.
That's one of the scenarios where I think the Reid approach is more effective. As McVay learned, you can't confuse Belichick with similar looks. Reid learned that you can't really confuse him with multiple looks either, but if you keep trying literally everything, sooner or later something will break through, and now you have an opening you can exploit.
All your points about the benefits of McVay's approach are accurate, and there are situations where it's better than Reid's. This just happened to be an easy example of one where it goes the other way.
If anything, it supports your central point: McVay's approach is more resilient...personally, I think the only playcallers that can really have sustained success with Reid's system are Reid himself, and Pederson.
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