( no, seriously, I'd love to see more of these. There's a gap in my list that would be filled nicely with a QUADFURY )
4 chips isn't enough to do a string design, so it would require a 10 Amp DC/DC converter, adding cost and board space. For the same space and price, you could make a 6 chip string design like we did.
Then clearly there's mad profit to be made - you should get on that right now
Indeed. Obviously, the problem is not the cost of the components, it's the availability.