Originally Posted by light_rises
I think the difference is that Sam & Max don't have the same long history with item combination puzzles as other adventure franchises do. There had only been one Sam & Max game before Telltale came along, whereas every single Monkey Island prior to ToMI had item combining. And now after two seasons (and soon enough, three) without item combination, it doesn't necessarily seem like an essential element of what makes Sam & Max games what they are anymore.
I think this is a good explanation. But, I must admit, while watching the Giant Bomb Video I was totally, in my mind, trying to use the Gun with the Beacon =P