I agree with pretty much everything in your post except this:
[{quoted}](name=Loken Stoneheart,realm=NA,application-id=3ErqAdtq,discussion-id=r3Gib0Z3,comment-id=,timestamp=2015-04-19T23:17:11.740+0000)
Really, besides a handful of offenders (lets be honest, when isn't there a broken champion somewhere in the game?), and the fact that they need to shift Cinderhulk's %HP to a normal item so that laners stop taking smite to get their hands on a decent tank item for once... (I'm not seeing infinity edge or deathcap being a smite-only item)
The %HP being on a jungle item is important because many tanks have laning phases that are so weak that they can only be played in the jungle. Top lane Sejuani/Nautilus/Amumu will get eaten alive by 99% of the top laners in any given meta. So naturally, when those champions don't have something that makes them playable in the jungle, then we see Lee/J4/Vi jungle like we did earlier this season.
However, putting the %HP on an item that isn't available outside the jungle (and most importantly, ISN'T AVAILABLE WITH WARRIOR ENCHANTMENT) prevents the Warrior-enchantment rushing junglers from being "real" tanks. Not only did they take a damage item over a bulk item, their bulk items give them less bulk than the junglers who have committed to building full tank. Now full tank is defined as Cinderhulk/Randuins/Spirit Visage +25% HP as opposed to Randuins/Spirit Visage/Locket or some other reasonable equivalent.
I bring this up in every Cinderhulk thread because people seem to understand that Cinderhulk is why tanks are strong, but are completely wrong about WHY Cinderhulk being a jungle item is so important. Since Cinderhulk and its %HP are a jungle item, the bruiser champions who, historically, have been able to have the best of both worlds in early game strength and late game bulk must now CHOOSE whether they are going to be early game pubstompers or late game tanks.
We can see this phenomenon even better with the Smite top laners that have started showing up. Champions like Shyvana are giving up Flash (substantially reducing their early game safety) in order to take Smite, which doesn't help them at all outside of allowing them to eventually purchase Cinderhulk. The fact that we've created a situation where bruisers are WILLINGLY SACRIFICING their early game in order to be tanks instead of having tanks just be eternally outclassed by bruisers is incredible, and we shouldn't just kill that choice by taking the %HP to a non-jungle item.
Basically, the reason Cinderhulk is smite-only is because it's the only way to compensate tanks for their substantially weaker early game compared to bruisers. If the bruisers don't take Cinderhulk, the tanks get an insurmountable late game bulk advantage; if the bruisers do take Cinderhulk, they lose substantial burst on their early ganks, essentially putting the tanks and bruisers on a level playing field. All of these advantages are lost if %HP appears on a non-jungle item.