We already see the slopification of everything as companies have been reducing the quality of their output for many years. Look at windows 11 vs 98. Yes it does more and crashes less but is it actually better apart from that? Of the things both of them do, which one does them better? Which one runs faster? Which one is easier to use?
Windows is the result of having almost the entire market. There has been no reason for Microsoft to improve windows because it won't sell more licenses. They have already sold Windows to every person who will possibly buy it. So the only avenue for growth is selling additional services on top like cloud subscriptions, AI products, etc.
Contrast that to the last 10 years in Linux where things have become immensely better.
Given the hardware these systems run on, and the compilers and development tools they had available, Win98 was actually the more impressive piece of engineering.