Why hasn't the HP bug been fixed yet?

I'm wondering why this bug that has been reported thousands of times and strongly affects PvP hasn't been fixed. Sure, they have the time to implement crappy systems that nobody cares about like CV, or crappy features like expanding hero light, but when it comes to bugs months passes without fixes... unless of course they negatively affect BP's money incoming, in which case they get special hotfixes a couple days after being reported.
And don't tell me it's just a visual bug or it's lag related, because in a 1v1 match I just hitted a mage for 22k with destruction and he was still alive (the previous round I killed him with less than 4k damages...). And that is just the most recent example, dks (just an example, the bug is used by all classes) that regenerates 200 hp per seconds, hence have 10k hp, have their hp bar always full, even if I deal way more than 10k damages, so how can it be just a visual bug?
I've been playing this game now for almost 4 years, can any moderator ask developers and then answer the following question "why, unless a bug affects the money income, it takes so much to fix a bug (IF it gets fixed), and yet developers have the time to implement features that are completely useless?"

 

You might not have actually hit the mage for 22k of damage.

 

@-Genesis-
1) If you have evidence of such a bug/exploit in the game, please contact Support. Include said evidence and a comprehensive description in your ticket.
2) Evidence = clear screenshots and/or a short clear video. Support cannot contact the Dev. Team and say "Yeah, um.. there may possibly perhaps be a bug of some sort with someone's HP 'cause someone said they hit someone else like really hard but they just wouldn't lay down and die". They're gonna reply "Pics or it never happened".
3) If it's a genuine bug and not just a visual glitch, it'll show up in the post PvP statistics summary. Kindly include an image of that in your ticket.
4) This is one of those thingies that we can't really help you with here in the forum. And it certainly isn't something that other players can assist you with. So.... closing.