It shouldn't be this way, but DDR4 is perfectly fine and will last for years. RAM generally has low failure rates; and prices are relatively better on the used market. If you want ECC, many used DDR4 ECC sticks seem like a 'relative bargain' compared to how much DDR5 ECC goes for.

As for GPU, AMD hasn't raised prices by as much; and honestly my 3060 12GB from many, many years ago plays absolutely every single game I want to play at 1440p; with nice visuals. Yeah, I can't pump everything to ultra, and maybe I need some DLSS for the most demanding games, but it's far cry from "old" or "obsolete".

In terms of actual experience or enjoyment I get from video games, I'm not missing out on anything.

It's legitimate to feel disappointed and upset at the current state of the PC market, but slightly older desktop hardware is still more than plenty fast enough.

I own both a MBP M5 Pro 48GB, and a MacBook Neo, and I use my Neo probably 2x as much as my MBP.