[akiselev]

Uhhh have you ever dealt with Broadcom? The BCM2835 chip powering the RPi zero isn't something you can buy without negotiating with Broadcom directly and a minimum order size in the tens or hundreds of thousands. That is a far cry from STM parts you can order off of Digikey or Mouser. Even some of my bigger clients won't base products on Broadcom chips for that reason alone.

And no, even in the best of cases where you have great software support from the vendor (ha! as if) and a great reference design, adding a GPU to a design is expensive because of both software and hardware R&D. unless you have an integrated CPU/GPU combo but then you're back to the problem of dealing with Qualcomm/Broadcom.