See now here's a light that appears to be direct drive, with up to 4 parallel cells and 4 parallel emitters:
https://budgetlightforum.com/t/-/39069?page=85#comment-1000955
So this is going to be able to in principle pump about 24 amps through the driver and it seems they like it that way so that they can use fewer cells if desired.
I suppose they could parallel out 32 AMC7135 chips, 8 for each LED, and maybe they should be doing that. That would probably add $10 to the cost of the light at least (just my guess). But a PWM feedback would at least give it controlled modes for that super expensive 50 amp FET they've got on it, even if it doesn't help the efficiency any.