As a hiring manager I am sure you're aware that when consulting professionals in the recruiting field, many people are told to replace their old title with their new one. The position they reach is more important when moving up than the one they had for X period of time, and many employers won't dig too deep into it, especially if the potential employee can sell themselves.
On a CV someone would put X time at Y company, was role Z. How long role Z was is not normally listed and if I got a multi page CV with every role listed at each company I would toss it.
You want people who other people vetted as good enough to do <blank>. It's often a first pass filter to even get to your inbox. Why wouldn't you read the rest of the resume.