IF you count a request for continued examination a "disposition" sure. However, many (most?) applications include one or more such requests. And so, there is much more back and forth than your post implies. Filing such a request typically gets you at least two more back and forths.

I agree with your point, and I don't consider RCE a disposition. Still, the average application has about two office actions (CTFR, CTNF, CTRS, CTEQ) before an allowance or abandonment.