But your original question was not if they will play on Steam Deck, but why someone would choose to buy those games on PlayStation instead of PC. Aside from the original reasons I laid out, higher resolution is another good reason why.

As an example of when games ported to PC are not as great as PlayStation games, here’s an excerpt from an article about The Last of Us Part I:

Even Naughty Dog itself had severe issues getting the game to run at 60fps, which required maximizing the CPU and GPU with a triple buffered rendering pipeline, and suffice it to say that porting to PC is an even greater challenge than that PS4 port.

Many of the problems at launch would cause crashes – often. I counted 12 separate crashes from starting the game until meeting Ellie, and this was on an AMD GPU which, unsurprisingly, this game favors. Nvidia players had it worse, or at least based on my testing with an RTX 2070. The main cause stems from memory limitations as you exceed the VRAM requirements, which then bleeds out into the shared graphics memory within your system RAM, causing hard page faults, reduced performance, and increased CPU demands alongside other memory related issues.

https://www.ign.com/articles/the-last-of-us-part-i-pc-vs-ps5-vs-steam-deck-performance-review