For striking art, if you put your stronger side back, there is a problem.
If your opponent keeps moving toward your side door (blind side), your leading arm can jam your own back powerful arm. Your powerful back arm may not be able to reach to your opponent.
Of course you can use spin back fist for that. But you have to take the risk by turning your back to your opponent.
If you put stronger side forward, by moving your back foot side way, you can rotate your body in such a way that you can make your leading arm hook punch (or hay-maker) very powerful. Since your powerful leading arm is closer to your opponent's head, your hand will have less distance to travel. If you can generate power by body rotation, your leading hand will have the same (or more) knock down power than your back hand has.
So by putting your strong side
- back, you will have powerful "cross". But your cross will require long travel distance. Sometime, your back hand can't reach to your opponent.
- forward, you will have powerful "hook (or hay-maker)". Since your hook can borrow your opponent's downward parry force, that will be your advantage.