the thing is that Helmet allowed insomniac to make ratchet a ps5 exclusive. allowed housemarque to make returnal a ps5 exclusive. BP made Demon Souls a ps5 exclusive, all in the first few months. then they didnt bother releasing TLOU remake for the ps4 despite the fact it wouldve easily run on it. Then released a $300 million spiderman 2 only on the ps5. its a company of contradictions, but i go back to developers from SSM and GG themselves saying how they didnt want to leave PS4 games behind, and how the ps4 allowed them to do everything they wanted to. I think the devs decided on this, and herman and jim ryan had nothing to do with it. they were probably happy but i doubt they mandated cross gen games at the biggest sony studios. sony is very hands off about what IPs these guys choose, let alone interfering with development just to milk the last gen audience.
you look at Ghosts and Death Stranding 2 being next gen only, being allowed to have 5-6 years of dev time, and they both failed to take advantage. I dont think its Herman. I think something just happened at these studios (kojima isnt even technically first party) that made them lazy.
Herman and jimbo or the upper echelons at Sony can be blamed for BP, Bend, Concord, Fair Games, and a bunch of other GaaS games that never materialized. But the rest is all on the devs. they did cut the budget of SP games, but the devs shouldve been smarter about it and chosen UE5 to reduce development costs.