Putting the start menu button in the middle of the panel rather than at a corner seems to forget Fitts' Law. Is this a push to make people use hotkeys more or just bad design?
While it is a totally legit point, the macOS dock hasn't been corner aligned since OS X 10.0 too and it seems people got used to it. Probably not a big deal after all most of the time.
But through it all the Apple has stayed glued in the top left corner of the screen, the furthest left thing on the menu bar. The one time they briefly contemplated eliminating it/moving it to the center was IIRC in the Mac OS X public beta (which I think I still have lying around here somewhere, would be a hoot to try to get it running again under QEMU maybe?). But there was harsh feedback from a lot of us in the PB on that one and it was restored from 10.0, so there was never a public release of a "Mac OS" without it. And even though it's visually offset a bit from the edge of the menu and when you click the highlight box also seems offset from the side, that doesn't actually affect the clickable area one bit. You can jam your mouse to the upper corner pixel blind and it'll still open right up. They've stuck with Fitt's Law on that one at least even amongst all their other GUI "innovations" in the last few decades.