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The group nesting and sum features in Airtable are slick and potentially very useful, but not being able to display a weighted average in the groups’ summary bars is really painful. The solution to this problem appears, at least to me, to be very simple: Just implement an option in the summary bar pulldown of formula columns to apply their formula across the summary bar.
The existence of this feature will probably make or break whether our company will use Airtable.