> Since no eGPU is built on the same architecture as Apple silicon, there are no drivers for it.
While it might stop eGPU manufacturers from achieving the same level of system integration as Apple, there's no reason an integrated GPU can't coexist on a system with a dGPU. Multiple major GPU manufacturers ship ARM drivers, and presumably you can still run modern MacOS just fine with external graphics hardware.
The more likely answer seems to be that Apple is deliberately not focusing on this feature so they can sunset support for non-Apple GPU hardware.
