That is why I prefer to incorporate the “no more than one unit per territory or seazone” rule.
I think the great variation that bids provide allow for great replayability. Who wants a game that always depends on what kind of dice Germany got G1? Pick sides, set up the board, roll a couple dice, quit. Blech.
To your point about a 12 being too much, though - only 1 game has been finished in the league this year with a bid over 11, and the axis(-15) won.
Most good players are not going to give their opponent more than 10, is what we’ve been seeing in the league results. And among what appear to be opponents of close skill level, the Allies have won at +9, +10, +8, +10, +9, and +8. And the Axis have won at -9, -15, -7, -9, and -11. Yes, that’s a small sample size, but it seems to be pretty even.
I think the best judges of when a game is fair and balanced are the players. As you can see, over half the games have been run at an 8 or 9. And 2/3 of those games have been won by the Allies. You have people that don’t want to give bids too big, people that acknowledge the Axis has an advantage, people that don’t really want to play the Allies - it’s an interesting and fluid dynamic that always seems to find its own level.