because have a specific inbox or email folder that requires a workaround in order to merely "empty" it via your iphone is ridiculous and not remotely productive in the first place. Yes we can take it further and state productivity on any scale of having to move, delete or sort e-mails is counter productive on a manual scale but, let's not.
The inability to search through e-mails, for something specific, select those specific e-mails, and then move, delete or sort ONLY those e-mails is, there just aren't enough words. There is no justifiable reason to have such a feature removed, and idiocy isn't a valid reason, especially idiocy that requires a multi step mistake to bring about such policy. It's like people crossing a road without looking and getting run over and the solution, we build walls alongside every road. Great.
Let's all walk into walls.