One thing that Rondavu's style does is impose discipline. I'm sure we all know how tempting it is sometimes to go all-in on a marginal call, and the problem is it doesn't take many of these slightly-erroneous bets to decimate your stack (that's the story of almost all my major losing sessions, I'm sure).

So basically, it's easier to make mistakes, and because of the nature of the beast, BIG mistakes, when doing the all-in thing.

(Obviously, no-one on this forum makes those kind of mistakes, but, you know, some poor saps do )