Is that type of "future proofing" really worth it? Spending extra $400 today and using the computer until completely obsolete, instead of futile attempts to kee

Is that type of "future proofing" really worth it? Spending extra $400 today and using the computer until completely obsolete, instead of futile attempts to keep up part by part, seems cheaper and easier to me (unless your goal is to be able to play AAA games at max settings on release).