[andai]

The article says "M4 isn't using much CPU so let's add fancy effects."

There's some truth to that, in the sense of "the hardware can handle it now" (but he also mentions Vista, which came out like 20 years ago...)

If it's actually resource intensive, then the logic would probably be "let's make all last-gen devices a bit slower to encourage people to upgrade..."

At least, that's been my experience when upgrading iOS. It's basically the same thing except mysteriously way slower. (I wonder if the CPU throttling thing was part of the iOS upgrade that made my phone slow to a crawl a few years ago.)