Its an optional soft fork so since its optional in only some wallets it basically gets no adoption. It must be a protocol requirement for it to be standard, similar to ring-signatures on Monero.
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So both wallets in the transaction need to use it?
Payjoin isn't a fork. Stop spreading blatant misinformation.
Is it not a soft fork? Am I using the terminology wrong?
You're right I looked it up, I got the term wrong, optional feature not soft fork.
Yeah, at least on Cake wallet payjoin V2 requires the sender and reciever to support the feature. With v2 both don't need to be online at the same time, v1 required that both be online to process the transaction so even more niche.