Accepted by whom? And why do you refer to many people as no one? I seem to have missed out on a copy of the MUni bible which you are quoting.
And why are you posting this in a thread about a 20" learners unicycle? The weight of a small wheel does not require large levers to move, and 114s have easily sufficient leverage. 150mm is indeed a good size for MUni and I use it on my 29er.
The laws of physics say that 114s on a 20" are good according to this thread, and that they are the same as 145s on a 24, and like 175s on a 29er in the amount of gear ratio gain.
You remind me of when Unicycle.com swore by ancient wisdom that 170mm cranks are best for 24x3" wheels, and that without them your terrain must not be steep. Then Kris Holm tended towards shorter cranks and they quietly removed their silly long-crank advice from the pro-muni pages.