You can hide all of that on your sidebar customization settings, but yeah it’s annoying that it’s turned on by default. The Discover is occasionally useful, but I honestly use Overseerr for discoverability more than I use Plex’s built-in search.
My biggest complaint with Plex is the lack of support for .m3u8 playlists. I want to be able to give it a list of livestreams, and then tune into those via Plex. Plex obviously already has live-streaming support built in via their Plex channels, but they have actively worked against custom livestream playlists, (it used to be supported via an extension, but they removed extension support.)
At one point, I found a complete set of ROMs for every single game on retroachievements.com. It’s almost assuredly out of date by now, and I’m not saying it would have every single Vimm ROM…. But there would be a lot of overlap. If any are already wiped from Vimm and nobody has a backup, let me know and I’ll do some digging to see if I have anything comparable.