I thought the new m1 MacBook pretty much fixed all the problems? Who would want a vintage one, and why?

Didn't really fix the keyboard or the screen. I'd like a matte screen with a thick glass panel to protect it when closing, and a dust-resistant keyboard. And some USB ports.

Does have MagSafe though, does it not?

I thought the keyboard was reverted to the old one? I absolutely hate the butterfly ones and their new "Magic" keyboards. I exclusively use apple's old aluminium wired keyboard which were pretty much the same as the ones in MacBooks uit until 2015.

However I haven't tried the post-butterfly models as I hardly visit stores anymore since Corona. So they're not back to the old quality still?

Would you run it with Linux or as a Hackintosh?

How about both, virtualized, so that I can switch between them?

You mean Qubes OS?

Proxmox works fine for that, in my experience.