Powershell was 2006, so I suppose the real "peak windows server UX" was 2016 when PS was relatively mature and came out-of-the-box with the latest version.
If MSFT had back ported servicing stack updates to 2016 it would still be usable. As it stands it bogs down unreasonably when applying updates and needs lengthy DISM /CleanupImage processes to be run periodically to reclaim disk space.