A solution is to have somebody in each FE team with a "that's what the masses use" device. Screen-wise, CPU-wise, RAM-wise, network b/w wise. And let them use it as a primary dev device.

Doesn't sound sexy, no. Compensate them royaly. And make clear that they are superstars just by having this work environment. Then keep listening to what annoys them with whatever you are building, and let them fix it.