I'll try and clarify what I'm saying because there's clearly a miscommunication going on somewhere here.
Tear is bad for many reasons: It stacks slowly and offers no combat stats, hurting your early game. Its upgrade is lackluster in still providing weak stats, impeding on your lethality build when you should be at your strongest. By the time you've gotten it to transform, you have amassed an excessively huge mana pool, but the nature of the item itself means that it starts to burn your mana even faster (which is the worst aspect of the item), therefore negating the massive mana pool you wasted so much time building all for the sake of a mediocre damage steroid that doesn't compare to the damage you'd get from either a faster lethality rush or dipping into crit or AS.
Our point is simple: Tear is a terrible item and its upgrade is equally bad. It weakens your early game dramatically and is essentially pointless since jhin doesn't have mana issues most of the time, especially with mana flow band in the game now. The only reason we mentioned ER in the first place is to say if you are actually needing mana for jhin, it's a more worthwhile item, the point being that as weird as ER on lethality jhin seems, tear and its upgrade is worse. Skip both for all I care, just save yourself the trouble and skip tear no matter what.
Varus gets away with tear (and even he builds it much less frequently now) largely because he doesn't utilize the Muramana damage much (and with that avoids burning through the mana he has) and just needs a huge pile of mana to spam arrows (although ER still is better for sustaining his mana). Other than that, the only champ I can think of who actually uses tear is Ezreal, and that's cuz he procs it on his Q for fast stacking and efficient damage, unlike 99% of the champs in this game.
Sorry if I seemed terse in my last response, I was having a rough day and had gotten several knuckleheads not reading when they responded, so I spoke out of frustration. My apologies.