There is certainly lots of room for improvement in charging speed.
But... that can be also obtained with old fashion cells.
Take a big powerbank. They usually hold 6 cells. Good cells are rated at 3500 mAh.
Let's be very converstative and rate at 3000 mAh.
Max. advised/allowed charging speed is usually the the capacity of the cell.
So a 3000 mAh cell can be safely charged with 3A.
But for the cells lifespan it's advised to charge at 80%, 2.4 A
I'm aware it takes some fancy hardware but the max. total charging speed is 14,4A.
There are some brands slowly moving that way. But they use something like 2x 2.2A.
So, Anker, slap on some ports that can handle some juice.
Don't cap at a lousy 2 amps. because my charger can deliver 6x 3.5A over USB.
(that's excluding it's 2.5 and 1.5A ports, 12 in total)