They aren’t just glorified PCs. They are very similar to PCs in some ways, but each console has different hardware and graphics chips that have unique features.
One that is designed to be cross platform only uses the features that are either common to all platforms, or ones that the compiler (the software that turns their text based code into a program to run) can automatically figure out how to use effectively.
If the game is optimized with a particular piece of hardware in mind it can use it to its full potential (if the programmers are good). But the downside is porting it to another platform becomes a lot more work.
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