Why do Windows based PCs and Laptops appear to ‘degrade’ over time, appearing to run slower than when first purchased even after fresh Windows installations?

Question

Lots of variables I accept 《edited to remove personal view》

After say, five years, their performance is noticeably slower than it was when they were new, and the question is not in reference to increased graphical demands from games. The question is referring to day to day operations, web browsing and so on. Moving parts are limited, could they be the cause?

Thanks in advance

In: Technology

Answer 1

All answers are generic, not taking into account that MacOS and Linux suffer far less somehow.
The question was clearly Windows specific, and so should be the answer.