I already admitted that you were correct about Apple supporting a multi-button mouse. What you're missing us the fact that they didn't want you to have one until 2005. They made you buy a non brand mouse to do the job.
Microsoft made their first mouse in 1983 to go with Word, and it had 2 buttons. Go back even further and Xerox had one with 3 buttons in 1981.
The point stands that Apple purposefully chose to not bundle a multi-button mouse until 2005 becasue they didn't respect their user base. Their walled garden approach to computers and software is great for people who are just need a PC or a Phone. But historically their not for developers or power users.