Didnt really need any. I’m still using my M1 Pro from when it was released. My mom using the oldest Air now.
I've upgraded my desktops more with GPUs and power supplies accordingly, but old laptop SSDs make fine backup enclosure drives (no I haven't seen them lose data when unplugged) and upgrading RAM for larger models on a AMD Zen 2 laptop worked pretty great for me. None of these were needed, they were just nice to be able to do mostly before the higher RAM prices started.