In proper hands, 15-20 extra frames could achieve literal wonders.
Especially in conjunction with already proven much better RT capabilities (F1, Dead Rising, GT7). It's PSSR than needs to see improvements immediately, especially if devs want to focus so much on it (which is Sony's fault).
But this is objectively false.
PSSR 60fps Mode being better than previous Fidelity modes (not Performance, Fidelity) is terms of image quality is factual reality already. TLOU games, Ragnarok, Stellar Blade, Final Fantasy.
When competently implemented and especially with a1440p internal res, it already proved to resolve foliage better, solves dithering, and is able to depict genuine detail considerably better on top while having no impact on stability in motion at all:
Does it need work, and fast, especially because of some shared aspects in some games causing issues with the reconstruction, and devs wanting to focus on such low internal resolutions? Yes.
But there's no reason to get so carried away with nonsense.