Yeonne Greene, on 29 October 2017 - 12:04 PM, said:
One laser vomit alpha is significant all on its own, because that's one more hit you can expose for. More realistically, that extra armor is worth several minutes of incidental fire.
As for why bother? Because it will slow the 'Mech down if it's equipped with LFE or cXL. Because many 'Mechs still have the majority of their firepower there. Because many 'Mechs have the majority of their heatsinks there. Any of those things will take a 'Mech out of the fight directly either via death or disarmament or indirectly with loss of mobility and sudden heat-capping.
Taking the arm with it right now just happens to be a nice benefit.
Here's the thing though.
Assuming a vanilla 75-ton mech, and your build has a 50-alpha.
138 vs 96
Option 1, you shoot the CT.
After 3 direct hits, the enemy is dead.
Option 2, you shoot a side torso.
After 2 direct hits, the enemy lost whatever equipment was in his side torso. He keeps his arm.
After 3 further direct hits, now to the CT, the enemy is dead.
That's something like 60-70% more effort to remove the mech from the game.
At best, assuming they are LE or cXL and you ignore the CT, going for both side torsos is at best 30-40% more effort to kill the mech. But more often it's the CT is targeted next after a side torso is lost, because it's already been opened by stray shots intended for the ST. Which brings me to my next point...
When firing at CT, damage will invariably spread to both side torsos. If side torsos open up first, it can still be helpful to just finish them off and strip the enemy of some weapons.
When firing at ST, damage will invariably spread to CT and adjacent arm, but not as much to the opposite side torso. Since damage is spreading to the CT naturally, you generally end up killing the mech by having gone through its entire CT after you took its ST out. If you go for both side torsos, then any damage that was already naturally spread to the CT now goes completely to waste.
The only time that going for STs makes any sense is when you are facing chasses with certain hitboxes. I find the MAD-IIC to be one of these mechs - I find I can generally guarantee hits to the STs on that mech, and avoid faffing about with the CT because I know the CT is thin, can only be reliably hit from straight on, and I'm going to waste damage all over the place if i try to go for it from the outset.