And that's the way Windows' patches and updates have always worked. This isn't some amazing new twist that Microsoft has thrown at us. If I'd bought Windows 10 ten years ago, I would have bought it with the full knowledge that at some point it'll no longer be updatable without it turning into Windows 11.
If this is a fundamental obstacle to you then you should never have bought Windows in the first place. It's like buying a gasoline-powered car and then exclaiming "this is bullshit!" When it comes time to fill the tank.