Unless they're assuming it's exploitable on Apple Silicon as well, or are being extra careful just in case.
Things like OpenCore Legacy Patcher prove it's possible; they just don't want to.
I don't think anyone feels entitled to new features in perpetuity. Security updates only would be fine thank you.
Don't tell me the richest company in the world can't pay for a couple of developers who just want to rest and vest to take care of and test the legacy platforms. A cushy job and you keep the customers happy.
Ironically the best way to stay safe on these computers is to install Windows or Linux.
Who is forcing you to upgrade?
For that matter, what hardware?
I run an old Intel Mac and it’s perfectly reasonable for casual work. I’m not paying for stuff like Adobe leases though.
For example, I have 2015 macbook pro. The last macos release for it is Monterey. Even brew has problems with that, erroring out when installing packages like libpng and complaining, that I should upgrade xcode cli tools. Which I can't.