I had the joy of helping with a Teams to replace Slack rollout at the start of the Pandemic. During which I had multiple meetings with Engineers and Product folks at MS. Two reasons struck out as significant problems.
The first was that Teams is Skype and Sharepoint mashed together with duct tape. When you'd ask for improved UX, it would all fall to "Ah yes, the Sharepoint team would have to do X so the other team can do Y. They aren't built like that, though, so you cannot have it". Teams is not one product and will never feel that way.
The second was scarier. I was trying to encourage communities of practice and having open communication by default, with some private rooms when needed. Like in Slack, you have multiple channels rather than disappearing into your own Team. Promoting openness was anathema to their Product people "Why would you want people to see what you say? Privacy is the default". I got the impression MS internally is not a safe space to speak, and Teams has that same cultural baggage.
The first was that Teams is Skype and Sharepoint mashed together with duct tape. When you'd ask for improved UX, it would all fall to "Ah yes, the Sharepoint team would have to do X so the other team can do Y. They aren't built like that, though, so you cannot have it". Teams is not one product and will never feel that way.
The second was scarier. I was trying to encourage communities of practice and having open communication by default, with some private rooms when needed. Like in Slack, you have multiple channels rather than disappearing into your own Team. Promoting openness was anathema to their Product people "Why would you want people to see what you say? Privacy is the default". I got the impression MS internally is not a safe space to speak, and Teams has that same cultural baggage.