How do certain "multi-hit" skills work?

[gamepob]

Thanks to all for your answers.
I think it's safe to say that we are simply looking at this from two different perspectives.
The thing is ... I play around this limitation. I still try to circle around, or go through them in order to fully utilize the skill. And like I said in my previous post, I am partially successful in that. And the reason I was only partially successful is the reason I started this thread. I got my answer, thanks to you guys, but that answer raised an issue we are talking about now.
The issue being: why is the inability to fully utilize skills whenever I can, the result of a technically bad design and not the result of my bad play style. You yourselves said that the reason I don't get that flank buff or back crit every time I see myself applying the skill properly, is because server calculates one thing and client the other. Not skill, playstyle or environment limitation.
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[gamepob]

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What I am trying to say is that what you guys say, is the result of your experiences in adjusting to deficiencies of this system. It's not the result of a game's basic design.
Imagine that not being the case. Imagine that every time I saw myself hitting my enemy in the back I would actually get that hit counted as back hit. Imagine how that would change the game? Your only limitation in using the skill properly every time, would actually be your own skill alone.
I dare you guys to say and think, that such a thing would be worse.
That's where our perspective is different. You guys already play adjusted and focus on other aspects of combat. I am at my start and I simply can't fathom how one of the most important parts of the game works so haphazardly. Maybe I need to play some more before I will adopt "It's as good as it can get" philosophy.

I think it's also safe to say we will not be able to agree on this, no matter how long we discuss it, so thanks again and have a nice day.