My current supervisor do it right, a big decision is stared in slack. It usually attracts 3-6 people in that discussion. A huddle or teams meeting is arranged if needed.

Then another slack discussion is posted with a v1 proposal in it, and link to previous discussion. This time, more people can give dissenting opinion. If nothing conflicting, a short sharing session will be held presenting this, and see whether there's dissenting opinion again.