You can make threads in slack. The implementation is a bit weird but (as of last time I used it circa 2018) it did the job sufficiently. For features which requ

You can make threads in slack. The implementation is a bit weird but (as of last time I used it circa 2018) it did the job sufficiently. For features which required more focused discussion from a sub-team over a longer period of time there was a pseudo-room feature (I don't remember what it's called though)