@dkurtenbach while we're in the holidays, we would do well to consider the words of one who urged against straining at gnats only to swallow a camel.
You assert that in earning two MBs a month, an ambitious scout undermines his/her troop and patrol. But, in the same reply you say ...
In other words, by your own admission, the merit badge program enhances the life of many units.
In other words, some MBs include a service requirement. Therefore, in the process of earning all badges, the scout will necessarily perform some service. I would argue that in the process of earning