Here you have undoubtedly some of the finest processor technology available, manufactured in the hundreds of millions, wasted by the constraints of its platform. If the Pi foundation had access to cores, processes, and even pieces of this level of technology the overall computing world would be so much more capable.
Even beyond that, the iPhones themselves? Severely limited by the I/O they possess. As these devices age they could have several recycled general computing purposes but they're constrained by the single lighting port. iPhone use NVMe storage, they have PCIe lanes!
All this work, effort and engineering for a platform who simply seeks to make more off of the revenue of whales in their app stores.
Edit: I think my comment around Pis is a little misleading. What I meant is the general educational Linux community. Not specifically the Pi foundation. If after X years Apple unlocked the bootloader and you could install other operating systems to better leverage the hardware I'd feel better about the state of it.