I still have my iMac G3 Bondi Blue in my basement. I had an Intel MacBook but sold it because it only ran up to MacOS 10.7. It worked fine about 10 years ago. Now I doubt it will.

I have 2 (an i7 MBP and an i9 iMac)and rarely think about it, except when I want to try some local AI idea or do something intensively GPU related. Unless you want to do something like videotranscoding or high-res, high frame rate gaming/simulation/eye candy, they work great.