why is spear of shojin allowed to exist
top lane is usually decided by who gets the early kills(in solo queue anyway) but spear of shojin breaks this dynamic by making you unable to lose 1v1 to anyone, unless you are several thousands of gold behind. Meaning that even if you're behind you can still splitpush and 1v1 or 1v2 anyone that tries to stop you, just because you built spear of shojin.
This item alone also changes how a team approaches a teamfight. Normally you could just kind of ignore a renekton late game in a teamfight, now your entire team needs to pour resources into cc'ing him so he doesn't kill anything he touches. The item alone makes the entire team need to play around it or they'll lose.
The item itself is pretty good cost efficiency wise, considering it has one of the most game changing effects of any item. And there's nothing stopping 
from just rushing it and never losing a 1v1 again, they just need to smash their keyboard against the opponent and win automatically because they have so much cc and dmg from the effect alone. It even provices enough cdr to lower their ult cd enough to constantly have ult up.
