It would be a big mistake to deprecate F5 as it's quickest way to flesh basic parts. It would take significantly (!) more steps to do similar with volume automation.
I just think it would be just easier and less confusing for users to have it all on one page.
Volume automation is great for fine adjustments , final draft, but because you can't simulteneously adjust several tracks, it is a much, much slower process. F5 is just irreplaceable
