I am sure a 4K camera can be used, but most people (normal) are not keen on having a super high detail camera on themselves.
4K webcam would be good for a social media centered person or live streamer or other up front and personal display of themselves...
I for one think 720p is fine for Zoom, Team, Webex meetings because I don't have perfect hair, no makeup, and not wearing sharp clothes when I have meetings.
At our workplace, we ordered a lot of 1080 webcams during the pandemic to support remote work and many people (mostly women) refused to use the 1080 and wanted the older 720 or 480 because they said they didn't want to put on makeup at home everyday....