Well, that's my point. If that was sufficient brand recognition for all these years, why all of a sudden is it not good enough? I'm not sure how having "MacBook Air" or "MacBook Pro" on the bottom bezel looks "too busy". I've never really heard that complained about before. In fact, I think they look much nicer WITH the subdued text there, and it leaves no doubt what computer you're looking at. And isn't one of the main complaints about the notch that it's "distracting", which would go against "minimalist" principles? Again, I'm not saying I agree with that, but it's definitely a complaint you hear.
And the notch disappears from sight depending on your theme/background and in full-screen, so that doesn't make for a really good brand identifier, since it's often not even visible or noticeable.
Or just keeping the chin, which they did (and when people questioned why, "brand recognition" was the number one answer people gave . . . even though no Apple logo). And again, since when is a single Apple silhouette considered "too busy"? It was a very clean look imo and far more powerful brand-recognition (since it's a trademarked logo). I think they're just playing around with the design as designers are wont to do. Some people will like these decisions; other's won't.
Actually,
as has been discussed, the notch does indeed provide "functional improvement". True, the white bezels don't add functional improvement, but neither do many other aesthetic choices Apple makes on it's various products that have nothing to do with brand recognition. For example, some iPhones have flat edges and others round edges. Neither of these is a brand-recognition decision. It's simply an aesthetic choice, just like the white bezels. I think a far more logical reason for the white bezels is to harken back to the "fun" look of the original iMacs.
I'm just picking one of your examples here for the sake of brevity, though I could make similar arguments for others. If this is true, then why not make all Apple Watches and iPhones white too (or another color that most other phones aren't)?