have it so people can change all models  from undetailed item to detailed items so that way people with good computers can play with detailed items and the people with potato computers can play with undetailed items.

If your talking about for the 1.15 update they are making it more minecraft themed and not out of place but good idea

love the idea but most likely it won't happen 

This will not happen. However we're writing the 1.16.5 version specifically to support resourcepacks for pretty much all models. Therefore you could install a custom made resourcepack which adds back the detailed models