The M2TW engine did not allow the players the most important of MTW, had, feature....
The civil wars!!!
The faction limit was to small to create "shadow" factions (like RTW/BI)....
The civil wars were very often in most of medieval kingdoms...
A good player in M2TW could conquer the whole world in very few turns...
Plus that a player could not "play" a medeival naval battle!!!
ETW engine is most interesting with the vast faction limit becouse it will allow us to create
"shadow" factions for most of the kingdoms...
That way historical events like the "Dukes" rebelion in England or the successors wars in HRE,or the constent civil wars in "Byzantine" empire will give the game the ultimate realism...
Plus the "unlimited" region settlements will allow us to create the medeival world more accurate...
Think...a village that could become a motte and bailey and could have the same time two villages as part of the same province...The same time in the south europe and midlle east a vast number of urban centers to present accuratly the diference of the poppulation growth in those times...

The game will have more accurate goals (not 60 provinces to qonquer)with that engine...