Ratchet is 1800p without RT. Still a great job was done with that game I'll give you that.. I don't believe the consoles are at 2080's level. They're often compared to a 2080, but no games have actually performed that well. I know NX gamer said Death Stranding does but that's the only game.
You say it's good for last gen visuals at 1800p/60. I agree if they were like a 2080 (btw a 2080 could do 1800/60 + RT + ultra settings. The ps5 can't even run Uncharted 4 at higher than 1440/60. Control was a last gen game that the 2080 did am amazing job on with a full suite of RT: the ps5 runs it with RT at 30fps with medium settings. That's not even close. I've bought every single last gen game that got a Ps5 native update and they all are pretty much only 1440p/60 and are scaled back visually from their "fidelity modes" which means they're not even max settings. I'll give you another example: Greedfall. The rtx 2080 would slay that game. Ps5 again is 1440p/60 and settings are again not ultra. Alan Wake Remastered on ps5 1440p/60. Ghost of tsushima directors cut is the same settings as ps4 just has a little res bump. Mortal Kombat 11 ps5 version has to use DRS to get better settings. There are many more examples if I had my ps5 library in front of me I could remember more.
I don't think anyone thinks the consoles match the RTX cards in RT. That's just accepted.
I don't game on PC so I can't give specific rebuttals, but DF and specifically Battaglia always say the PS5 is around a 2070 super or a little higher, and the Series X perhaps more like a 2080. So that's my case, really, I admit.
But what you're saying doesn't really make sense. Surely you'd concede that even if they're not actually up to a 2080, they're not THAT far off? Because inferring from last gen patches that they "can't" (as opposed to "don't") do more than 1440p60 or so implies a performance increase of something like 4x over the PS4. I mean, we basically know that that's nonsense.
So what's left as the most likely explanation is just that the vast majority of the patches are quick jobs that don't take proper advantage of the systems.