Those limitations to tank/station size are associated with economics, not the technology. Same with the cost of both stations and fuel in general. The $1.5M, 180kg stations are pilot stations, built in small volume for a small number of cars to use. That's a very different situation to potential future costs and station size if development and rollout continues. Lets not confuse that
Hydrogen, with the current thinking, is integral to the battery. The hydrogen is not meant to turn the wheels directly, but recharge the battery that drives the electric motors. Out of interest do you know the Mirai's acceleration is limited by hydrogen conversion or is it more to do with the power of the motors. Lets not forget that 10s isn't exactly uncommon in ICE vehicles, nor is a similar acceleration uncommon in a BEV. Tesla are not the norm in the acceleration stakes remember, and <6s acceleration is unlikely to be the norm when BEV's become mainstream.
I wasn't intending to infer that those costs would stick, or that single pump stations would remain the norm. But the current costs suggest some incredible economies of scale would be needed to reduce the cost of infrastructure to something reasonable. The Japanese are aiming to reduce costs to 50% by 2030 by installing 900 filling stations.
On performance, the motors in the Mirai are marginally more powerful than those in the 2018 Leaf. The Leaf hits 60 in about 7.5s.