Fedora didn’t do anything to Libreoffice. Red Hat had been the maintainer for the Libreoffice packages in Fedora up until a couple of weeks ago. The package became an orphan, and without anyone to maintain it, would end up being dropped from the distribution. For the time being, it looks like some people from the community have stepped up to maintain Libreoffice in Fedora.
So unless something happens and the current maintainers are unable to keep up, nothing should happen to Libreoffice in Fedora.
You can actually tell KDE to use a window manager other than KWin. I’ve used i3 with KDE like this in the past, and it’s pretty good as long as you tweak the i3 config a bit. Somebody wrote a guide here with the necessary config changes.
Little disclaimer: I’ve not done this in years, but the linked guide was update recently so I believe it should still work ok.