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.
The norms on where files belong are really dumb.
Similarly, programs being entitled to strew files all over kingdom come.
Ten different ways to install software and maybe one or two of them actually keep track of where all the files are and clean them up properly upon removal.