I think that argument falls down in the face of the PWA mess in Europe. Standards-based application platforms, to Apple, are at best, a means to an end. And they'll throw them out the second they perceive them in competition with native apps. It's the same recipe followed by MS in the 90's.
Run by the same management. I think an argument of the form "OK, they're trying to kill browser apps on iOS but clearly they love standards and would never do that on a Mac" is unpersuasive.
People have been making dire predictions that macOS will get locked down like iOS since the days when it was called iPhone OS. Not a single step down that slippery slope has ever occurred.
But hey, keep preaching doom, if it entertains you. Just don't expect other people to take you seriously, given the track record.
If on Monday of last week someone had predicted Apple would kill off web apps on iOS, you'd have surely given exactly the same response. And so on Saturday, now they they have, I find that unpersuasive. Make that of it what you will. One person's "preaching doom" is another's "reasoning from evidence".