Hi,
As Daniel wrote, MUST is probably to strong here, it is enough to
mention that it can lead to problems if you dont discard such messages.
If you have a client that always shows the user if a decryption fails,
this also means you need a client that has absolute perfect
deduplication in any kind of scenario.
Otherwise you show the user he misses a message when in reality he
doesnt miss a message. Pepare for many Bug reports.
At the time the XEP was written, even mam:2 was not widley deployed, so
saying any client can have perfect deduplication was far fetched.
Nobody wants to use a standard that constantly gives the impression you
miss messages when there is no problem at all.
Also there are still quite a few mam:1 servers out there, so good luck
deduplicating if the message is encrypted and there is no stanza-id :)
Regards
Philipp
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