Personally, I would have preferred the smite buffs to be on the enchantments. But that would render Trailblazer's useless, unless it gained some sort of clear speed buff to compensate. Dead monsters deal no damage. Thus you finish a camp with higher health and would not need the HP gained.
That being said, it does also enable AoE damage on smite. For example,
doesn't need more sustain. But a faster clear time would really help him to keep up with laning xp. tbh I'm not happy with his jungle itemization either. Just last night I sold Stalkers - Devourer for BotRK and got a huge power spike. Sure I was missing the smite upgrade. But it let me win 1v1s vs a fed Yasuo.
Back on track, yeah, the jungle itemization idea is great. I like upgraded smite. I like being able to enchant my jungle item as I see fit. But the item abilities are mostly lackluster. Most jungle champs don't need more tank. They need a slightly faster clear time. This will help them indirectly with HP, and directly with gold/xp.
Oh, and Warrior's just got nerfed from 45 AD to 40, making things even worse. le sigh
By the time you can afford to buy the enchantment, you don't really need it.
This is what happens when jungle monsters get buffed.