Shyvana does actually have CC but its only the small knockback on her ult, which honestly I don't find very great to begin with as say dragging your enemies along with you all the way. It can still be useful for say interrupting channeling but that's about it and not a lot of champs do that.
Her passive I absolutely agree on, ever since her mini rework. It's just makes her more feast or famine in the game since she relies on farming the jungle a lot. Can you get dragons? Yes? Get small bonus to armor stats. No? Keep crappy stat passive for the rest of the game!
And yes she's not the best ganking jungler but when you think about it she's not really meant to be that. Most of the time, she focuses on farming, taking objectives, and counter jungling, as well as beat you over the head with all the gold she's gathered (which kinda makes sense since lots of fantasy dragons are greedy for massive amounts of gold).
She can pull off some ganks when situations call for it, but it usually has to involve the laner engaging first, especially if they have good CC, to keep the opponent there so she can arrive, have the enemy laner extremely over extended, and have Shyvana have red. Post-6 is a bit better since she now has a gap closer but you can easily miss it sometimes still or they just see it coming and avoid it.
I do agree that sometime she needs a tweak or even argue a higher scale rework in the later future. BUT BY NO CHANCE WOULD I EVER SAY SHE NEEDS SOMETHING LIKE SEJUANI'S PASSIVE! Yeah, Sej is insane and has CC and that's one of the problems with most tanks right now. On top of this you also have to realize that with all the power she has to blow up squishies, melts tanks quite a bit, and is slightly faster than most Juggernauts she can't really have any or at least a lot of good CC at the same time or else she'd be broken. She would need to lose something in order for that to happen.