Why would I pay on the order of $750 for a new motherboard, RAM, and CPU for AI features I've no need for?
And which ($750) motherboard, RAM and CPU would that be? - Ryzen AI (300)-series are laptop chips.
Whether or not you'll have to pay any significant premium for those over comparable models with "non-AI" Zen 5 mobile chips remain to be seen. But so does this supposed fantastic laptop of yours in which you *don't* have to change motherboard (and RAM) to upgrade your CPU, as long as it "doesn't have AI" in it.
And in case you wanna refer to desktop CPUs and APUs with AI accellerators in them, those use the same AM5 motherboards and DDR5 RAM as any other "non-AI" chip of the current Zen 4 and next coming few generations (Zen 5, Zen 6).
If Intel desktop is more your jam it's not very much different there. If you want to upgrade to the coming Arrow Lake you are gonna need a new motherboard (new socket again, LGA1851 this time) and you're gonna need DDR5 RAM (no support for DDR4) - regardless of whether or not you get a CPU with AI accelerators onboard or not.
If you're using anything with DDR4 right now, then if you wanna upgrade to the new stuff from either Intel or AMD, you *will* have to buy both a new motherboard and new DDR5 RAM. But that has nothing to do with AI. It will be the same if you get a CPU or APU without AI.