In low luck you can ensure destruction of the units you want at sea by having 3 submarines. So if the attacker comes at you with 4 fighters and a battleship, you might kill the defending fighters before the submarine because you KNOW that 3 submarines = 1 hit to a naval ship, where as the fighters allow the defender to chose their casualties between naval and air units.
In low luck you can attack with far fewer units then you would in an ADS game because you KNOW that your punch selected will win the battle with no chance of the defender winning, so why put the extra units at risk needlessly?
For instance, America has 2 Fighters and an Infantry in Russia. Novosibirsk is garrisoned by Japan and America wants to clear it out. In LL America can attack with all 3 units and be guaranteed that Russia can blitz in and out on their turn because there will be no defenders. In ADS America has a “good” chance of missing the defender with a 33% chance the defender will hit the attacking infantry. I say good because my fighter pilots seem to be blind, deaf and dumb when it comes to offensive combat. That means I generally have to bring 2 infantry and 2 fighters to guarantee I kill my enemy in 2 rounds or less. LL, not a problem! The two fighters kill the target, the infantry can absorb any hits the defender gets.
Changes the whole dynamic of the game from a real game of Axis and Allies to a formula. It’s like turning Chess into Checkers, IMHO.