If you want a client that looks like discord, you may check out Cinny.

I use Super Productivity for this. Not perfect, but good enough

Yuzu does recompile some parts during runtime by using a JIT, but the rest is still emulated.

You can’t compare them to Wine, since Wine acts as a compatibility layer by translating OS specific calls, but it does not translate between instruction sets.

FYI if you click on the top right arrow when playing a video, you can switch between fit/fill/zoom mode. This should address your second issue.