Bugs in your WM can cause crashes and often do. You’re trying to pretend this is some ridiculous foreign concept when it isn’t. The two are closely linked.

If KDE works for you, great. It crashes often for me. I find it exceedingly hard to believe it hasn’t crashed on you at least once when that’s such a common experience among me and my peers. I put more stock in my own experiences and the experiences of people I know than random internet commenters. I don’t know what else to tell you.