What is the benefit from each hit being "perfect"? You can do that with Beat Detective and samples or DFHS or BFD. Maybe he's trying to get something comparable to that without losing the "live drummer feel" that is sometimes associated with timing correction.
Mic placement is the usual remedy for unwanted bleed. Some bleed is usually desirable to maintain a natural sound. I like my toms with no bleed also, and every since I started using Andy's trick I have none.
Room dynamics? Cymbals and the actual drums are all still part of the same instrument.
There have been many, many great drum recordings without employing these seemingly eccentric methods. One of my all time favorite drum sounds is on South of Heaven - which was recorded the traditional way. I'm not saying that he doesn't get killer drum sounds, because he really does - I'm simply playing devil's advocate. I've heard professional drummers complain extensively about producers "wasting" the bands time and money in the studio doing shit like this. I wouldn't doubt that 10 years down the road, Machine will talk about how he "used to" record drums.