It's not that simple. You've got *more* compressed files on the PS5, possibly using different compression methods. Unless we know how much of the loading time is data throughput and how much is decompression we can't draw a conclusion like that. The PS5 version is twice as compressed. It could be spending a lot more of its load time decompressing than those files than the Series X, and it could just so happen to work out at about the same exact total time.Then again, the PS5 version of the game is about 45% smaller in size than the XSX version.
I do agree on the loading thing though, I don't understand what is happening there. There simply is absolutely no reason that the PS5 and the XSX should load a game in the exact same amount of time. Like NONE. Absolutely none. There I no technical basis for it to even remotely occur. Even if everything that had to the with IO processing on the PS5 was 30% slower than the XSX, from just raw IO transfer throughput the PS5 should still end up loading faster.
Whatever the case, both load so much faster than previous gen versions, that in practice both load plenty quickly for my liking. Maybe they could have further sped the PS5 version up with more work, but they figured it was already more than fast enough. Maybe they put more priority on getting the file sizes as low as possible while matching Series X load times.
And if so, that's fine by me too, cause storage expansion options are a bigger problem on PS5 at this exact moment of time (though hopefully not for long).