Why is the Belgian division rated A?

Help me wrap my head around this one. I don’t get it at all. This division has the A rating and is apparently considered very strong in 1v1, but:

• They have no heavy (even medium) armor. All their leopards have max range but no armor.

• Frontline mech infantry has the game’s worst AT weapon and comes in IFVs without missiles

• One helicopter

• Standard options for arty, planes, log

• Unremarkable AA

How is this division supposed to be used and what are its strengths?