Why would a PC gamer buy a new console when they know that the PS exclusive on PC looks better than the *less expensive* console?
And the answer might be cost. Here's just a few factors:
What PC does this PC gamer own? How old is it? Is it as powerful as the new console?
How much does this PC gamer value a small advantage in fidelity? A larger gap?
How much more is this PC willing to spend to achieve said fidelity gains?
How much more is this gamer willing to spend just to play the game on PC, even if at the same fidelity?
How long will the PC gamer be comfortable waiting to play said PS game on PC later?
What's the cost to upgrade their PC to match the new console's performance?
Is this cost more or less than the cost to buy a new console?
What's the cost to upgrade the PC in order to have the power to surpass the fidelity on the new console? For how long?
Could they spend less than it would cost to upgrade their PC and still play the game on the new console at a higher fidelity than their current PC can achieve?
Is it worth buying a new $700 graphics card, or a new $500 console?
Maybe they'd rather save that $200, but "have to" play a few game on console.
$200 can buy a lot of games on PC or console. Cost is the key factor for most.
If they have a PC that won't be able to outperform the PS5 or XSX, they might just buy a console as well. Play some on console, some on PC. Currently, most PC gamers don't have the necessary power to out perform the upcoming consoles. (And if they do, they spent far more than the console cost.) Value is of paramount importance, especially given the current economy.