Is there a list of which ones are vulnerable?

Element Call is in beta and works quite well. Jitsi was only used for group calls and Element Call is slowly replacing it.

Computers are designed to run 24/7 so as long as you have proper cooling your PC will be fine. It would be good to post your specs too.

This might sound stupid but CDs. I buy CDs and rip them to FLAC to listen with Strawberry Music Player or Jellyfin.

How will we be sure we can trust their benchmarks?