Hall's game may seem unorthodox and novel, but really its a throw back to the sort of attitude a lot of jiu-jitsu fighters had when transitioning to mma.
Which is to say, a pig headed refusal to ever do anything that might resemble working on your takedowns.
A lot of these guys had, and have, a weird complex about wrestling, which results in weird mental blocks in their thinking, which results in weird game plans. Hall simply takes that attitude further to its end in trying to shoehorn it into a practicable strategy, regardless of how disregarding the most direct and expedient options results in inelegant, 'long way around' mish mashing of different other skills to try and paper over the yawning void (all of which would demand more of your limited training time to make effective against top competition).