Also using fedora kde :D
I’ve just never encountered a problem with focus stealing or alt-tab issues and leave my drawing tablet/second display plugged in. My friend who runs side by side monitors also has no problems on their arch kde setup. Might just be a weird hardware+application combination problem for some
Edit: try digging in the kde focus settings, I think theres an option to tune focus steeling






Containers are ment to be used with docker networks making it a non-issue, most of the time you want your services to forward 80/443 since thats the default port your reverse proxy is going to call