Specifics: See above
Why it is needed: A great majority of games are created by new recruits using "Classic", "Standard", "Freestyle", "Escalating", "Chained". I think this is because it's the defaulted selections. While 6 players is the default, the number of players is also the easiest to understand without having to look at the rules (which most new recruits probably don't do

I feel Freestyle is more for an advanced player type, and that Sequential is much easier to understand. Not sure what the default play style is for the board game, but due to human limitations, I would think it's Sequential.