1. I agree that framing is an often underused element in good comedy, but it is still being used skillfully by professionals these days. Look at the work of British filmmaker Edgar Wright if you want inspiration regarding what framing can do to land visual comedy!
I think it would be fair to call the silent film era the "Golden Age" of film comedy, from the classical perspective, because so much of the basics of film comedy came up during that period. "Greatest Era" I find a little more trouble agreeing with. Our favorite comedies tend to come from our formative years, usually films we experienced as teens and young adults. I believe that's why we're so split on what the greatest era is - it varies with the viewer.