

Data centre GPUs tend not to have video outputs, and have power (and active cooling!) requirements in the “several kW” range. You might be able to snag one for work, if you work at a university or at somewhere that does a lot of 3D rendering - I’m thinking someone like Pixar. They are not the most convenient or useful things for a home build.
When the bubble bursts, they will mostly be used for creating a small mountain of e-waste, since the infrastructure to even switch them on costs more than the value they could ever bring.

Menu bar at the top at least makes some sense - it’s easier to mouse to it, since you can’t go too far. Having menus per-window like Linux, or like Windows used to before big ugly ribbons became the thing, is easier to overshoot. (Which is why I always open my menu bars by pressing ‘alt’ with my left thumb, and then using the keyboard shortcuts that are helpfully underlined. Window likes to hide those from you now since they’re ‘ugly’, and also makes you mouse over the pretty icons to get the tooltip that tells you what they are, which is just a PITA. Pretty != usable.)
Mac OS has had the menu at the top since before it was a multitasking OS. They had them there on the first Mac I ever used, a Mac Classic 2 back in 1991 or so, and it was probably like that before then too. It’s not like they’ve been ‘innovating’ that particular feature and annoying their users.