I’ve said this many times but what SketchUp different from other programs is that it only contains the minimum ammount of feature, the rest is added as extensions. This is very important to keep SketchUp easy to learn for new users whereas other programs often are overwhelming.
That said some features from extensions could be added to SU. Filleting and chamfering could be a Trimble extension shipped with the application but by default with its toolbar hidden (like solid tools). Support for surfaces in native Push Pull would also be lovely. No extra user interface is needed, just the underlying functionality. I think the community would benefit a lot from having these features with a nice proper user friendly interface. Regarding box scaling I don’t know how it’s different from changing the axes with Axes tool and then use native Scale tool.