Fair enough. The only argument I get for SimpleX over nostr based is the lack of metadata associated to your conversations on SimpleX. This is a real issue for some people but would not affect me normally. If there was a situation I needed that metadata split I'd just spin up a nostr identity just for that communication use case. Personally I think the WoT possibilities of nostr far outranks the anonymity of SimpleX for 99% of my interactions.

No need to compromise on discoverability or privacy. Nostr can be used as a discorrability layer for SimpleX (or any other messaging app) but this has been turned down twice. There were discussions about interesting SimpleX with Nostr last year but it never went anywhere, someone made a proposal for a contact info field to replace the DM button with but that was declined.