Right now, all important information is available in the left (main) column. Views are nice occasionally, and "last active" can be helpful, but I also could have gotten those from the front page before clicking through. So there's nothing essential in the right column, and I know I'm not the only user who routinely ignores it.
I disagree with your claim that the user isn't important. We shouldn't be making decisions like voting based on who asked, and that's probably part of why the user is identified at the bottom, not the top. But we should give attribution as clear as that given for answers, and the information in the usercard (and the hover popup) can be helpful. Plus, frankly, if I see someone known to be an expert in a field asking a question in that tag, I know I'm going to learn something so I'll be more likely to read on.
You asked how to request a change. To make a feature request, it's not enough to say "I'd like this"; you also have to make a case for it, including anticipating and accounting for objections. This often proceeds in two (or more) steps, starting with a discussion question asking why something is the way it is or how people use a feature, and then later proceeding to a feature request informed by what you learned.