The game is in balance if you use dice, its just strategy dependent. Most people (99 % or so) do not know the best allied strategies and henche they require a bid to balance the game.
An extra inf for britts in egypt is an easy balancing act.
If you use low luck rules wich is a horrible horrible rule that inferior players that cant coupe with unlucky dices then the game is tilted for axis favour. Also a lot of the options are inferior in the game and the game becomes very linear for most players.
The standard bid is 13 ipc for allies in low luck 1941 scenario on tripple A, people buy 2 tanks for russiaand a inf into egypt.
I’m of a different opinion but I dont like the allies go all in europe and let japan go nuts and try to place my bids differently.
For dice the bid varies from 3-15 but most stop around 10 for allies and noone had bid under my 6. I will probably go down to 3 for allies, and one day I ll try to see how far down i get the bid with a win, I bet I can go down to negative bids.