I think there are alternative FOSS launchers that you can use if the issue is the launcher itself.
On the deck I use Heroic, I think there are also for windows.
Playnite on Windows is the premiere experience for multilauncher support. Highly customizable, and it has a UX that's much better to lay-users than something like Gog Galaxy 2.0. Integrations are well QA'd and updated. It's wild that this was built as a FLOSS project because it's better than what billion dollar companies have done by a mile.
My only gripe with Playnite is how inconsistent feature support is in themes. You want to see your achievements? This theme has support, but it won't show data from How Long To Beat. This theme supports both, but cannot show console icons for emulated games... Hopefully this will change when version 11 is out next year, with more features from plugins being moved to core.
Other than that, it's great. I use it on a PC as a DIY console, Windows is set to start it automatically, and all my Steam games are here, alongside all my console games which I have downloaded as ROMs to centralize them all on a single device.
I find it's a good way to demo games. Get it free, if I like it enough after a few hours I'll go buy it on GoG or Steam and continue to play it on there.
There is no need to use their launcher, as there are open source alternatives. "legendary" is a tool that can download sand install games from epic, but it's command line only. Fortunately, there is also "heroic", which is a GUI for it and honestly a pretty good one. Can also handle GOG games.
They work well for me, haven't had epic's launcher installed in a very long time.