I use a corsair aio in a custom build. It's fine. It's exactly the same as using an aio on windows without installing icue (their device management software, which is pretty shit). You can't set custom fan / pump speed curves, but the defaults are fine. I'm cooling a 3950x and I've had no issues with temperature. You also can't adjust the LEDs but whatever.

Bloatware like iCUE (iirc one of the worst offenders) can reduce game FPS by 10-20 %, which is roughly the performance difference between one or two tiers of graphics hardware.

That’s wild, how does it do that? What resource does it consume?

That usually means LED control.

Water cooling itself has nothing to control, but there’s just the pump to be run at full speed at all time, and fans to cool radiators like you normally do with air coolers.

Don't you want to control pump/fans based on load and temperature though?

Motherboard usually handles fans based on temps.

I managed to install Ubuntu without trouble, but I've seen complains online about subpar Linux support.