With newer players who do not know all the optimum ways to exploit the G40.1 (or other) setup, the game is more reliant on basic player skill and no bid or handicap is usually needed for either side (this applies to all global versions, G40, G41, G42, BM, etc).
We often talk bidding in our G40 games, but players change each week and some people are still experimenting, so the bid isn’t really necessary.
On the other hand, once everyone gets up to speed, there is a pretty strong Axis bias towards the optimal play (withering unstoppable Moscow push x3 teams, or buy bombers with 3 teams and smash Russian economy you pick or combine the two), so a bid may be necessary.
The game won’t seem unbalanced until you push the possibilities to their logical conclusion. If you screw around with fringe ideas that are less than optimal, it will be pretty balanced. If you go for the critical path, the Axis have something of an advantage.
There is a balanced mod that tends to help the Allies with some NOs, this can be overlaid onto most setup versions, it adds fun, a bit of complexity, and increases balance.