My printer could theoretically print a black and white page in magneta when my black ink runs out, too. But logically, it doesn’t want to do that.

I just don’t think it’s a big deal to consider the printer a device that requires all inks to be present to function properly. If the printer is consuming some color inks in order to print black colors better the implication is that less black ink is being consumed. Either way you’re buying ink.

Some people are just cheap.

It’s not cheapness. My kid couldn’t print her homework because I was low on cyan. It’s not that I don’t want to buy more ink, but that the thing I was printing only needed black. If it weren’t a color printer, the output would’ve been identical and it wouldn’t have needed cyan.

No, its tracking dots if you send a criminal printed letter for ransom, they will track you down very quickly. Some people don't like being tracked continuously.

There are 0 other reasons, you being ignorant of basic facts and repeating your weird mantra doesn't change that.