Bids allow some opening Axis attacks to be blocked, such as SZ111 and Yunnan and also allows some allied attacks to be strengthened (Taranto, Ethiopia).
This differs from Balanced Mod’s approach which is to strengthen the allies later in the game. Both approaches have weaknesses IMO.
I’m struggling to find a counter to strong Axis play in either version. If Axis play well and dice are even, they should win easily.