I honestly don't understand why people don't leg.
I did a test (as dishonorable as I am i guess) to see how easy it is to leg mechs in this game with laser oriented mechs.
Pretty easy.
Biggest single balance flaw in the game, but no one complains because it is so rarely abused.
But what happens when/if serious league play starts and people leg all the time.
if you put in a no legging rule, people will get in trouble for doing it on accident, and why even have legs in the game.
This isn't to bring attention to legging, it is pointing out that people do things sometimes for the... fun of it?
I have armed people just to mess with them, but only when I know I absolutely outclass them in skill.
Other times, if I know I am going to lose a fight, instead of trying to core a mech, I will mouse ear it so that it has to go back to a full bay to reload.
I do this on a variety of mechs. But it is aweful easy to arm people in this game, if that is what you are focusing on, and if you get the correct arm (as you say the Shadowcat is an example) you then win by default as they lose the vast majority of DPS. I have won fights I would lose (say against a Bushwhacker in a Vult E) because I disarmed one arm and then had the ability to whittle down.
As a general strategy? I dont know if it is a good idea, but it really depends on the situation. Do you think people are _trying_ to arm mechs that don't need it, or do you think it is by dint of the mech moving and how the pilot is using the mech that they get armed?
I often get armed by Bushwhacker A mechs, because it is easy to force them to fire on your arms by twisting....
Oh, and also, killing components gives a bonus to money.