Not exactly a regression, but prior to A16, it was possible to programmatically enable and disable WiFi hotspot/tethering using reflection to run ConnectivityManager.startTethering(...) and ...

Samsung One UI 8 Rollout Schedule for Android 16-Based Update Leaked: Check Eligible Phones, Tablets, Watches Samsung Galaxy S25, Galaxy S25+, and Galaxy S25 Ultra could get an update to Android ...