Well the limit would stop you from doing that. The implementation would require that you agree on exactly what each player gets to bring. This could be done in a number of ways, but obviously saying "3 generals of any kind" would be extremely flawed.
It's not pointless, it's the only way the system will be worth anything. Yes, it'll be based on free will participation, but it should still be implemented in a way that makes it actually attractive to join in. Otherwise, they might as well not develop it at all.
This is a very bold, and very wrong statement. Balance is necessary for a game to be good. It doesn't have to be 100% perfect, and it doesn't have to be symmetrical balance, but it has to be good enough that both players have a chance of winning. If victory is a foregone conclusion for either player, the system is worthless. Look at any e-sport to see that the creators constantly strive to balance the game in such a way that either side always has a chance to win.