So I feel like riot made assassins capable of killing tanks. Why?

I remember back in the days of old, you have a nice balance triangle. Burst >> sustain. Sustain >> Tank Tank >> Burst. So um wtf? Riot has just evolved into perpetual fighting machines. I don't give a damn what you wanted to happen riot. You screwed up incredibly hard, want to know what the problem is? You know what we needed in the game last season? The ability for marksmen to shred tanks, and you know what? Lord domminiks does a bloody great job of it. But hey... let's see, this item was designed for marksmen and to a lesser extent fighters. But it was NEVER intended for assassins because this came before the update. I'd personally like to make this item ranged only simply because it's too strong. But hey, you may ask, what will fighters do against tanks! Well I'm pretty sure they're doing just fine right now, especially with all of that sustain they can easily pick up.

Alright let's touch on . This whole omnivamp is just terrible. I much preferred the previous version of just spellvamp. Especially when you can amplify the healing by an excessive amount via kit/masteries, and yes you guess it: other items. The reason Akali is in such a terrible place is because she has the kit of a sticky drain tank. So don't act surprised when she only builds bruiser. It's like beating my head against a damn wall here. Just ffs, make assassins BURSTY again. This is especially important with AD assassins because after their little flurry they can spam Autos and have almost the same DPS. Fix this please...

EDIT: The actual solution for this will take a TON of work, which I can guarantee riot isn't interested in putting in. Fix tank stats and base damages for tank champions. Break marksmen early game, and lastly dumpster this whole assassin update. Sustained/longer fights are no places for assassins.