XP had major problems, it was only until SP2 when it became the gold standard
When XP was launched, it was derided for its 'Fisherprice' desktop UI.
If it were up to me, I would make Windows a hybrid between Win XP and Win 7. Maybe include Edge from Win 10, but that's all. No data slurping, no auto updates, no Groove Music, no Microsoft Store, no OneDrive hooks on File Explorer. Include classic pre-Vista versions of MS Hearts, Minesweeper and Calc etc. Include Group Policy Editor as a standard feature for everyone, including home users.
No Metro tiles.