You failed to read my original post in its entirety then, otherwise you would have seen that I said legging in MWLL is not as bad as in other MW games.
As I already posted, my main point is not that either "legging is fine" or "legging is OP".
I played MW3 a lot, so I got accustomed to the generally high level of sportsmanship many players displayed. It was originally intended to prevent legging and other exploits from a balance perspective, but then grew into something larger. Players would call eachother to duels while others stayed clear and didn't interfere. We would congratulate eachother on nearly every kill, and so on. It was a different generation of online gamers back then, but just because today's generation isn't the same doesn't mean we shouldn't promote the same values. It makes the game more fun and interesting, and really brings out who the best players are.
Legging is just one of those things that irks people, regardless of the balance. You can take a pilot out of commission faster by legging him than any other means, and while this is a team based game where you need to take mechs out quickly to accomplish your team's objectives, that doesn't mean legging all the time for time's sake is right on a sportsmanship level, otherwise the game will eventually just be everybody legging everybody, creating a very dull and frustrating online experience that MW was never intended to be.
You say "regardless of balance", but if you think that the game has the possibility to evolve into "everybody will just be legging everybody", without certain rules, then it
is a balance issue. As already said, you need such rules for certain things in games that are obviously imbalanced (like in MW3), since it can't be changed anymore. But you do not necessarily need them for actively developed games. Otherwise, in theory at least, such rules applied on a large scale can hinder the development in a way.
If you think it is always more effective to leg someone, but you won't do it, because of sportsmanship, your code of honor, etc., it's fine of course. But wouldn't it be even better, if the mechanics where changes, so that it would not be a problem in the first place, even without any rules and code of honor?
The problem is we've already pushed the amount of armor legs can take in CBT, pushing them out of viable target status isn't really staying true to CBT, but that has to be balanced with the perfect (weapon) accuracy of MW.
A certain amount of damage done to the Head of a mech is redirected to the torso. My guess is this isn't really staying true to CBT either, but it's still in the game. Also in CBT you can't damage legs
directly anyway (as far as I have read and remember?), so technically, any artificial change (like redirecting damage to the torso, like for the head) to the leg hitboxes and hit mechanics will still be staying "true" to CBT.