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You are right, ability to delete/edit messages is also one of the feature that I think Skype, Rocket.chat, Slack, etc. services implemented because of the demand. But Facebook Messages doesn't have that, afaik. :) So it depends what purpose PM play role or is mostly considered for using. If you cannot edit/delete message then you would have different mindset about PMs and you wouldn't write something that you might regret later on, just like here on comments/posts :)

one of PM usage will be for the marketplace
because PM+Escrow = ability to start one..

For me it's not acceptable to send only message that we "could not regret later on"
it can sometimes involve ur personal data/information that you need to send to someone.
It can be encrypted, but also deleted if or once you decide its not useful to have it on database anymore.
still have mixed feelings on this ;) but i totally hear ur solutions as well

exactly, that's why I have started this post to start discussions on topic and usage of PMs... ;)

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