For me the turning point was when a failed Windows forced upgrade ended up deleting me important files. I had backups, but I lost days of work because Microsoft felt so insecure in the face of piracy that they had to upgrade my computer despite me constantly telling them not to do so.
That was around 10 years ago. I went through various KDE distros; in the end I settled for Kubuntu.
The recent developments in KDE plasma are excellent. I haven’t had to open a command prompt in years. I hadn’t had a tech problem until this year when my tmp folder got full.