Thank you for your continued feedback. We are currently working on this, and recently announced this feature for developers in Beta. For more information, please visit https://developer.microsoft.com/microsoft-teams/blogs/importing-3rd-party-platform-messages-to-microsoft-teams-is-now-available-in-beta/.
An error occurred while saving the commentMatthew Adams commented
If this lands, the only real barrier to adoption for me is the ability to switch identities quickly and cleanly.
This feature remains on the backlog. We will update you when we have status changes to share.