well, no. you can use MVVM with UIKit.. or VIPER.. or CLEAN. I have seen them all.

And on the note of the app you are developing now.. you would be surprised! I don't often plug my own apps.. but if you look up snap web studios in the app store both of those apps are purely SwiftUI with maybe one or two UIKit bridges for the hacker news app. Eggy is ambitious from a UX perspective, and the HN app is just straight-up impressive and demonstrates that you can make complex and very fast SUI apps.

edit: also, not sure if you were aware -- but you can use observable objects & such with UIKit :P