Updating iOS and apps without WiFi
In its current state iOS does not let you download system or apps updates without WiFi. With apps it is technically possible if you go through each app one by one and manually request it to update over cellular network but that is very buggy and cumbersome. Neither does it let you enable automatic updates over cellular.
Limiting updates to WiFi might make sense in the United States which has poor cellular networks. But in Europe 4G and 5G is everywhere and you can get mobile internet with unlimited or very high GB limits.
iOS should let users enable automatic iOS system and app updates over cellular networks.
iPhone XS, iOS 15