Why I can't remove old hardware from my OS? Why I can't create OS with new name?

[speeder]

So I started my own operating system, for "generic hardware"

Later I created a custom hardware, think of something like "Macintosh".
Then I wanted to make an OS that was ONLY for that hardware.

But I can't. Even if I click the "new software" button, I can only create a version or something. I can't set a new name, can't disable the old generic hardware, and have to wait tech to be updated.

This is silly. Why I can't imitate Apple?