MSGraph is slower and not as convenient for email compared to JMAP. In addition to requiring more API calls for the same result, MSGraph starts throttling with HTTP 429 responses after several calls, making the initial synchronization much slower than JMAP or even IMAP.
Hopefully, next year there will be JMAP support for Contacts. As RFC drafts, there are already JMAP specifications for Files and Calendar...
No doubt JMAP is superior for the problem it solves. I wonder if it will matter in the end though. I have the impression MS is positioning it self to be the only viable AI platform where mail and calendars are just a tiny part of that. So while not really competing in the same domain it may be that both IMAP and JMAP may feel as relevant to the world as IRC or XMPP in the not too distant future.
Sure, and we're the vocal (?) minority here. The SOHO/corporate/family world will uncritically use whatever shit MS regurgitates for them for all the usual reasons.
