There's already a lot of replies to this comment so it clearly hit a nerve with a lot of people!
All I'll add is that if this was 5 years ago, I'd completely agree with you as I've had my timeline completely screw up before, or other unusual behaviours that ended up causing a project reset. And I'm not the only one[1], I remember this video when it came out.
But while I'm not a regular YouTuber or videomaker, I still use Kdenlive about once a month and anecdotally it hasn't done this in at least 4 years. However, having software that you spend so much time working with ruin a project is legitimately traumatising, so I understand your strong feelings.