Also, the more console-like approach could be used to give external GPUs more uses. Sure, not everyone is going to get an eGPU, but it would be a nice option to have, instead of just having to replace the whole thing or offering two or three models of it like the various PS3 models, PS4 and it's Pro model, and the rumored PS5 Pro and the rumoured new base model with a detachable drive...
Also, the more console-like approach could be used to give external GPUs more uses. Sure, not everyone is going to get an eGPU, but it would be a nice option to have, instead of just having to replace the whole thing or offering two or three models of it like the various PS3 models, PS4 and it's Pro model, and the rumored PS5 Pro and the rumoured new base model with a detachable drive...