I talk about this elsewhere in the thread (https://news.ycombinator.com/item?id=33139416), but for me, looking at more notifications is still net positive if it leads to less total time spent on the phone.

Without a smart watch, the flow for all my notifications is "notification -> take out phone -> (probably) use phone". With a smartwatch, the flow for the majority of notifications becomes "notifications -> decide it's not urgent -> leave phone in pocket".