I can't speak for all those interested - but I think one common theme is that we see much persistent disagreement in the world when agents share their estimates - Aumann says it is unlikely to be epistemically rational and honest (although it often purports to be) - so what is going on?

Your proposed coin-flip is certainly faster than Aumann agreement - but does not offer such good quality results. In an Aumann agreement, agents take account of each others' confidence levels.