One of the things that all user interfaces do is marshal user attention, and newness or freshness is one tool for that. That can be used to advantage or disadvantage users, but it is a constant pressure for change in user interfaces.
The term Modern in user interfaces tends to translate as “inspired by the Functionalist school of Industrial Design, particularly as exemplified by Dieter Rams at Braun and Apple’s Industrial Design team under Jonny Ive”. There’s functional value to freshness, so the definition isn’t static, but the term Modern means something other than new or contemporary.
It isn’t a waste of time for producers and critics (in the neutral sense) of user interfaces to learn some art history, architectural history, and history of Industrial Design.