One thing that I see as lacking in all modern team chats, is the ability to speak and leave voice messages.
For project manager on the fly, writing or voice message can be a difference of a lot of time.
Productivity just jumps.
Hence the reason why a lot of companies I know choose to use WhatsApp for voice messages.
If space would include this, I think it would be super awesome.
Btw. I like how you integrated chat into git repos, wonderful.