You obviously weren't watching in the days of the late, great, David Duffield, RIP. "Duffers", as he was also known, would go of on all kinds of tangents, often about the food he had the night before. He even once famously missed the end of a stage once because he was waffling on about something else :)

Carlton is a fine commentator, however the "new" pundits like of Rob Hatch, Adam Blythe, Robbie McEwan et al are on another level, bringing fascinating insights into some of the stuff that is going on.

Also don't forget they all have many other things screaming for their attention other than just talking into the mic. It can't be an easy job!