I am all for dogfooding here, but if the dog-fooding is not improving the product it shows that the goal is to eat market because of lopsided ecosystem monopoly. Screw MS and MS Teams.
eg. : We need a tag in a shared channel so that we can provide single point of support for other teams, instead of people having to tag the whole channel. Slack made is as easy as breeze to sync on-call person from PD -> a group.