[kergonath]

> "OS" in this context means "scheduler", i.e the code that coordinates your application tasks

If you define the context to mean it and then assume that everyone agrees with your implicit context, then maybe. In reality, OS and schedulers are not the same thing.

It’s also a leap from the “MacOS 9 was not an OS” GP position.

[rvense]

> It’s also a leap from the “MacOS 9 was not an OS” GP position.

That wouldn't be the first time I've heard that statement, even among classic Mac enthusiasts.

[kergonath]

Then surely there are instances of people saying that it is “not an OS”. And I don’t mean hyperbole.

Here are 3 definitions from 3 different sources: https://www.wordnik.com/words/operating%20system . Not a single one even mentions process scheduling or anything to exclude MULTICS, CP/M, DOS, or any version of MacOS or Windows. I know that some people think that being contrarian on HN is cool, but this is beyond ridiculous.