Although Nothing OS 4 was glazed too much but, it doesn’t feel like a significant leap forward. The update mainly introduces two clock styles and some minor UI tweaks. The visual overhaul, while noticeable, feels more like a glossy finish, but not much in terms of functionality. In fact, it seems more like a refinement of OS 3.5 than a true jump to OS 4. no material U expressive as well. true black mode was supposed to come at start which is real simple thing they added as feature in 16.
The AI Playground, appears to be little more than AI running in the cloud to generate PWAs that are then installed as widgets. I hope the add more stuff with future updates rather than just number from 15 to 16. personally I feel like its a bi-monthly update than android 15 to 16 transition.