Wireguard.. I cant live without that and no way could that be rebuilt with nostr.
Clock.. doesnt (shouldnt) be sending data to servers, but possible for storage of lightweight preferences. Id want that to be encrypted.
Assorted apps reading REST based json APIs, some GRPC. These also wouldnt work well via nostr due to protocol bloat. That includes apps like Fountain for podcasts.
On the flip side, apps that need some authentication to identify would benefit by using nostr login vs email addresses or as an option in many cases. But bear in mind, the more data you tie to a single pubkey, the more that is collated about your life and behavioral network usage patterns. So thats a double edged sword
