There's probably bit of hardware lot it with Intel chips. Since they control the hardware, Apple probably has invested quite a bit into hardware specific optimizations that won't readily port to AMD chipsets.

Also, AMD is only recently been a performance front runner - they might not hold on to that for long. In the short term it doesn't make sense to jump ship.

For for general computation/ecosystems or for generation/device specific ventures (e.g. Consoles) it makes sense to turn with the tides.