There is a certain niche that’s impressed by a long CV, but it’s not he kind of niche I’d want to impress. They’re people who say things like “look how many versions of PHP he can use. And he knows how to use The Linux!”.
That's why I bring it up.
I'm sure it's important for the first page to be concise and eye-catching. But why would more info be bad?
Many hiring managers don't look at resumes longer than 6 seconds. More information is not necessarily better and arguably worse for competitive job openings.