[bluehatbrit]

That's fair enough! I don't think it's about completely eliminating all decisions from happening in slack. It's just the one's OP was talking about where they would benefit from the whole team having the opportunity to consider the topic and give their input. Smaller decisions which only require the input of a few members of the team and shallow conversation I think are fine to be had in slack, that's where slack works really well.

I think a bit of it boils down to each team being different as well, if you need a team to be more agile then using slack more might be the right thing. In OP's case they sound like they need their team to slow down and consider some things more deeply and slowly. In that case pushing those topics out of slack may make sense.