Mistwell
Crusty Old Meatwad
OK I tweeted him. I think we're both wrong in our interpretation, but I'd put it closer to yours than mine. Here is what he said:
Mike Mearls on Twitter said:[I meant] the idea of players thinking of actions as resources in 5e runs counter to design. want players to think more narratively, action flow intuitively. Ex: Lame that barbarian with two weapons can’t strike with both and rage. No reason clear why they can’t in narrative.
The idea of actions as an economy to think about is better suited to a more tactical game. We don’t see your turn as an efficiency puzzle we expect you to solve. Players might do that on an individual basis b/c they like it, but not focus of design.