Reason for lighting armor for PVP and LA for Perfect World

Notice how the only physical classes that use it, do so because they're forced to, not because they want to? Honestly, by the time you get to the 70s or 80s, it's not so great for caster classes either.

You are not quite sure you are following what you said. That's a typical end-game BM build. You are not sure what the 5 str 1 dex per level
 is supposed to mean. Without marrowing, LA's magic defense will be greater than the HA one. But if you use marrow, you'll see HA wins out in balance. If you marrow with LA, you're asking to be oneshot with something, be it is magical or physical. As the refines get higher and higher, the difference in HP widens.

There's no point for a BM, or a barb for that matter to be switching gears in the middle of a giant PK fest. Look at the BM full buffed with demon marrow on. 10k resistances of each. That's quite good if others ask you. You want to get higher mag def? Sure switch it out to LA and marrow it. But check out your phys def. It's absolutely abysmal.

Overall, LA has:
- crap mag def
- crap phys def
- crap HP per refine

It's completely terrible compared to HA.

As for assassins and archers, they gimp their damage too severly for heavy armor to be of any use of them. Though, heavy armor sins and mages have been contemplated before, the damage sacrificed was too great to compensate for the defense boost. Though if they could sacrifice without too much damage, you bet they would choose HA.

Why do you think people say archers and sins are squishy? Check out the veno forums. Next to no one goes LA for PVP. There's a reason for that. LA is like a "you really can't use anything else, therefore you will use this" kind of armor