cygnet3 on Nostr: I think part of the reason is because the silentpayments module for libsecp256k1 is ...

I think part of the reason is because the silentpayments module for libsecp256k1 is still under development. SP benefits a lot from the efficiency that module can provide, I see some projects holding off on implementing silent payment support until it's merged.

There's also just the general chicken/egg problem of sending/receiving support. Implementing sending is a lot easier, but there is no point if there's no good wallets to receive silent payments. And doing receiving properly, especially for mobile/light clients, is still just a lot of work.