If a group has the choice between realtime and asynchronous channels there needs to be a guideline for this.
If my org takes pride in consensus for everybody, everybody needs to have the time to submit input. It's not uncommon that some active users in a chat go for an ad-hoc decision just because they are more than one and want to work _now_. In the long term this damages the culture, splits the participants and is difficult for newcomers.