Random fact: I sometimes wake up in the middle of the night, screaming in terror, gripping the sheets, drenched in sweat, remembering those times I thought I sent an important update to a client via Google Hangouts but for some reason the message(s) disappeared into a quantum singularity.
I’m saying the same thing lordbanks said, only longer (and with a little more ‘quantum singularity’.)
There’s something about Slack I still find annoying: the fact that messages can fail to deliver. If they can fix it so messages are held until network returns (like, idk, every IM service on earth), that would be mighty nice.