Oh, it should be easier now than with the previous generations, to be sure. But the way they did it with the Pro (disabling GPU resources, downclocking to match the stock PS4) illustrates the problem - their software is tied into the hardware too tightly for them to easily run it on another platform, even one that's only different beacuse of a somewhat faster CPU and more graphics CUs, with the exact same memory. Even that relatively inconsequential change, a side-step on the same generation in a console built to run the exact same games, needed all that testing before the games could even be trusted to work?
The point being, going from the PS4 to the PS4 Pro was a same-generation incremental step. Same amount of RAM. Upclocked processor, more CUs on the GPU, but essentially it's about as best-case scenario as it could be... and it still at launch couldn't even be trusted to run the same games unless it was throttled down to stock PS4 levels. Now, a PS5 presumably won't be using a faster Jaguar, presumably won't be using a similar but faster GPU setup, may not have the same memory interface and almost certainly will have more memory. Games made for the PS5 will absolutely be stunning, but I think they'll have to make tradeoffs if they're going to support BC and honestly they've been downplaying BC all generation because it's simply one of the very few areas that they're dramatically inferior to the competition at.
I'm sure it's selling well though.
