Can't speak for Denny but it's just personal preference for me. I've never had an infection from dry hops, vanilla beans or coffee beans and I've brewed since 1992, and none of those get steeped in vodka. So the infection argument is a moot point for me, as well as an extra step. Though I realize you can dose a pint and scale up, I like the approach of adding something to secondary and pulling the bag when the flavor is just where I want. Much as some of the coffee aroma is lost from cold steeping coffee beans as compared to dry beaning in secondary, I choose to infuse the flavor of any addition directly into the beer with no middle man. Again, just personal preference.