A 4K frame buffer is only 32 MB. It has 8192 MB of VRAM. So you should be able to run games at 4K. It's that "ultra" bit that won't work, since "ultra" these days tends to mean 10-24 GB of asset data. You'll need to drop textures and who knows what else down to "High" or maybe "Medium" to fit in 8 GB of VRAM.
My main point, which I will reiterate once again, is that you should not buy an 8 GB card and expect 10+ GB of data to fit comfortably in it. This is foolish. If you want to run games with settings that require 10+ GB of data, do not buy an 8 GB card. Either buy a better card, or reduce asset fidelity to fit in the VRAM.
My second point is that it's unhelpful for game reviewers to not tell whether settings exist in these games that fit comfortably inside of 8 GB of VRAM, and focus exclusively on settings that require more VRAM so they can show how badly that PCIe bus chokes the game at the high end. What does it take for Spider-Man to fit inside 8 GB? The reviewer doesn't want you to know, apparently.
What 50 series card is lower end?
You mean 16 GB. The card NVIDIA is making these claims about has 16 GB, not 8 GB.
I could understand being mad if your only options were an 8 GB 5060 Ti for $379 and a 16 GB 5070 for $549, with nothing in between. That's quite a price gap! But the way you carry on, it sounds like you're planning to buy a 16 GB 5060 Ti for $429 and sit there and seethe while you play Cyberpunk at 4K Ultra that a cheaper product you didn't want to buy that can't handle the Ultra textures exists at all. Do you generally seethe with outrage about the existence of cheaper things that you don't want? For example, how angry are you about the existence of the 4 GB Radeon 6500 XT side by side with the 8 GB version of the card? Were you shocked and upset that if you ran games at settings that required more than 4 GB of VRAM, the 4 GB 6500 XT performed poorly? Seething with outrage? I just don't understand your mindset here.