Can we talk about deaths dance

its frankly TOO damn good
the passive that makes skill leech life is fine i dont have an issue with that. and it also stacks with 
but the 30% damage reduction just makes ADC who get it just drain tank everything
and guess whats lets them do this?? the life leech of this SAME item.. which also gives insane attack damage.
where is the drawback for this item?
how are you supposed to burst down an enemy adc after they get this item?
i literally had a game yesterday where the enemy adc was fed yes.. but he had ZERO defense items except the passive from deaths dance
i didn have as much gold as him.. but i was still stilling on 5 items...
i landed a max range spear (Q) (R W) pounced in.. swipe (e) and takedown (Q)
this was NOT enough to burst him down... hes a freaking adc with no defense items... i have FIVE complete items... and i had been killing him all game
but as soon as he gets
, my full combo leaves him with around 20% hp.. (and that included TWO
procs)
and then he autos me 4 times and i die...
that should NOT happen
if the enemy ADC is out of postion.. all alone.. and i have 5 complete items... and i catch him offguard land a max range spear and HIT EVERY DAMAGING ABILITY I HAVE.. he should NOT survive that burst and be able to turn around... i GOT my full combo off BEFORE he killed me there should NOT be a responce for that.. he SHOULD be dead