Yeah I’ve seen a lot of resumes that details out the role and responsibilities of the individual in every company and project they’ve been. But that’s a little extensive, isn’t it? Usually what you need to know(as a recruiter) is what they’ve worked on, and I have the *right keywords* in the skills section :) so that’s covered. Regarding previous employment, the role gives an idea, and along with skills you can get a good picture of what he was focussing on.
Usually, if you see potential in such resume and you’d wanna know more, you’d contact the person. Sometimes, things as simple as website links are enough to start a conversation because their work speaks.