Laptop manufacturers do end support. The OS manufacturer isn’t the one who typically controls what hardware vendors will support. In this case Google is both so people tend to conflate the two, but there are plenty of laptops that are no longer supported by the manufacturer.

Computers tend to have user serviceable parts and to be much more tinker able, so it easier to not notice that dell isn’t supporting your laptop, you’re doing it yourself.

Lenovo didn’t update your laptop from windows 8 to Windows 11, you did. If the drivers went funky, you figured out how to fix them.

You can likewise side load your own OS onto the phone long after manufacturer support has ended.