We love to praise linux constantly and tell everyone to change to it (they should) but what are your biggest annoyances ?
Mine would be, installing software (made even more complex by flatpaks being added, among the 5 other ways there already were to install software) and probably wifi power management issues.
Mostly video related.
YouTube videos are hella pixelated and sometimes the audio de syncs.
Also the active blocking some companies do with DRM. Things like competitive online games and some streaming services like Peacock.
Just the absolute resistance a lot of developers have.