Not really. The current system gives her some tactical possibility. Like use one charge to maintain health, and use the other as emergency, or keep both for emergency, or use both for maintain, or switch between these tactics.
Taric's way is actually a really bad one for mana usage, and efficiency. His heal does not increase with ranks only the maximum charges he can stack. His effective heal/s. is same with rank2 as rank5 after first heal, if he spams it. If he uses it only as every second, then still rank4 is enough for full efficiency. On the other hand it burns mana like HELL.
Yuumi is one of the champs, that extremely hard to balance without rework. Her untargetable state gives her the power to buy 0 defense, and thus get tons of AP by lategame. Give her good ratios, and she becomes a true monster. Give her bad ones, and she will be worthless. On the other hand her early game still dependent on her base numbers. Make those small enough, and her early game is a nightmare. Make them too strong, and she will become early "i win" button.
