Great, so each conversation is spread out and siloed. Thankfully Teams has good search and you can find stuff, right? Right?

> Teams is useful for chat & meetings, but Teams spaces are hugely helpful as document repositories, too, and it's additionally easy to add things like Gantt charts and other enriched content types through add-ins

Slack Canvas kind of does this. I'm not convinced having all your documentation in your chat/meeting app makes sense, but it could be useful.

> The ability to seamlessly transfer a Teams meeting connection between arbitrary devices (laptop -> desktop, phone -> laptop, etc).

Zoom does this too, and has for years. I think I've seen Slack huddles offer the same option too.

This happens in Zoom as well, without the extra Teams downside of external attendees being 4th class citizens.

> 2. Teams is useful for chat & meetings, but Teams spaces are hugely helpful as document repositories, too, and it's additionally easy to add things like Gantt charts and other enriched content types through add-ins.

This is really simple in demos, but tends towards sharing documents via email again (for external attendees) or growing the channel size massively (for internals who need the documents but aren't obviously needed in the team).