Sorry what? Wikipedia is running MediaWiki, which is fully open source.

Is the result even used?

its*

they’re not required, only the update manager thing wants you to. if you update via dnf you don’t need to restart 90% of the time

been using linux for a few years both on servers and my pc and I never had to build sth myself

How exactly? When using Linux, I get similar problems to those I get in Windows but in contrast to Windows, I’m able to find a solution and solve them.