I also love when people are confidently wrong. OS8 supported 2-button mice, along with OS9, and OSX. You’re confusing the fact that Apple’s mice didn’t have 2 buttons with whether or not any 2-button mice worked. I know because I owned one. On top of that, you can still, to this day, emulate OS8 and OS9 and use the “secondary” click.
So are you going to admit you were wrong or are you going to gaslight me and tell me I didn’t use a two-button mouse more than 2 decades ago?
http://www.gearlive.com/index.php/news/article/why-apple-makes-a-one-buttoned-mouse-01280820/
“Apple supports multi-button mice. Right out of the box. Furthermore, this is not a ‘new feature’ of OS X. Support for contextual menus (the primary use for the two button mouse) have been around since OS 8.6, which is now more than seven years old. Let me repeat, Apple supports multi-button mice.”