That'll be how many titles in the end? Especially if Sony now has one eye on PC for all titles? Also how much of a visual difference would those better assets be? Enough of a game changer to warrant the notably-higher investment in the IO?
It's an important starting point though. And, as I just said, Sony's interest in PC sales may affect how much they push their hardware too. A look at R&C will show the limitations (or lack thereof) of the PC and how big a market cross-plat titles can go with PS5 IO.
That all said, the history of features on consoles is a pretty discouraging precedent, with many features failing to manifest meaningfully for the console even into later titles. Whether XB360's "smart eDRAM" where the MSAA got dropped when games moved away from forward rendering, or the PSP's Bezier hardware, or VU0's massive underutilisation in PS2, too often hardware designers put in stuff that just was questionably worth it by the end of the device's generation. I'd argue that projections of what will be important over the entire generation are more often wrong than right.
PC ends up a bit slower and with portals opening later, so loading is a little slower sometimes and there's more of a loading screen.
