I think an end-user product would not be a 2-minute 70% variety for the reasons indicated. That performance would be quite useful for something like a Tesla, of course.
More important, to me, is the capacity vs physical size, and the number of charge cycles it can withstand.
If my phone could charge from 0% to 70% in ten minutes, and do it 1000 times over its life, I'd be more than happy.