Are you?
how are people supposed to know?
How are people supposed to know that in the future there will be features that will not run on their current hardware? Well, I guess they could read any of the many articles that talk about the future OS, or just use common sense, as that is, and has always been, the case.
You stated earlier that the $3,500 you spent on your 2019 Macintosh was a lot of money for you. Did you do any research before you purchased it? Did you read reviews on other tech sites? Did you watch reviews on YouTube? Was Apple’s website the only place you looked before you purchased it? Did you know that every year Apple releases new phones with new features that only run on them? Why does it surprise you that the same is true for their laptops?
There is no notice on the Apple site.
What would you like this proposed notice to read? “Apple, like every technology company that is a going concern, is constantly releasing new products and software. It is highly likely that at some point in the future, there will be a release that will contain features that will not be supported on any hardware you purchase today.”
Surely you agree there should be such a notice?
Nope, I do not, as I think it is self evident that current hardware is not guaranteed to support all future features.
warning that Intel CPUs may not support features?
Nope, just as I do not think there needs to be a warning on the Apple Silicon Macintosh page that says it will not natively run Windows.
On the page where you buy the product. Not hidden away on a beta page.
You are talking about an unreleased product. Your argument seems to be that people who are about to spend $3,500 on machines do no research on them before they purchase them. Apple does not hide this information, it puts it where it makes sense, on the page for the new product. There are also many (many, many) articles both in the tech and mainstream press explaining this specific topic.