I used to record in 4K on my GoPro 8 and drone (and static cam if I was using one), but have dropped everything back to 1080P now. Main reason is that it is plenty detailed enough and still looks really cool. Also you have fewer space issues on SD cards, and the resulting video is much faster to edit and loads much faster onto Youtube.
From a sound perspective, I found the foam covers to be quite effective to reduce wind noise. But it makes voices quite muffled. If you aren’t doing commentary, just recording riding noise, then they are perfectly fine. Nowadays I use Rode wireless mics with little dead cats on, with the receiver plugged into the GoPro media mod and clipped into the flash mount. The sound quality is much better, and I can have two transmitters to capture my own commentary and a pal if I am riding with someone else. Not cheap, but very very good.