Steam Erased (uninstalled) some of my games without any warning

These games are still on your library.

steam doesnt uninstall games.

Yeah, it happens to me as well. You just need to "redownload" these games and they will be ok. I don't know what's the cause though.

sometimes the games just appear to be uninstalled i feel due to an error in steam recognizing the games location. 99% of the time if you hit install it will discover the already downloaded files, take 10 seconds, and your game should be back to normal.

this happens to me about once every 3-4 months, but it has yet to do anything negative other then waste 10-15 seconds

Steam blob file probably has problems yes?that blob file from what i understand is with the installed ones :)