Nice chart! Thanks for sharing, I hadn’t seen this one. 
I would add that another limit that’s a physical practicality is that many large layer / big nozzle prints are done with engineering plastics, which generally run high temps. That means you get real problems with cooling causing multiple issues when you try to lay down that much plastic that fast.
The volumetric flow is only one issue, so all the fancy nozzles and hurry-hurry thinking will run into real physical limitations that must be accounted for. CHT is a nice upgrade for sure, but not some lightning in a bottle.
Fast is fine and I think we all love faster prints but as @DzzD points out, you can only go so fast, period. BL has moved that marker forward but there are other limits.