JMAP for Calendars, Contacts and Files Now in Stalwart

I can understand why JMAP instead of IMAP given the latter's antiquated design. I don't see the advantage to clients in replacing WebDAV though, and the others are a bit iffy too. They'll need to make a way better sales pitch than 'JSON vs XML' (serialization ain't tough, XML is supported everywhere).

I guess contacts/calendar follows JMAP naturally when the clients already implement it, but that only applies in the 'already wrote a JMAP email client' case. Virtually any other case would rather stay with widely supported protocols?

Yeah because everything already supports WebDAV. It works well with iOS and Android which is imo a big advantage.

However, doesn't stalwart already also support WebDAV though?