That's right. Ceviren can already crank out Moderate potions at 90% unbuffed with no stat rings. And he's character level 6.
Also, getting gems without killing anything is almost impossible on one's own. Luckily, I know a Berylite. Getting gems, period, isn't that hard.
Cure essence is easy. Healing essence isn't. Sapphire dust, anyone?
Everything in Alchemy is slow due to the need to gather widely dispersed ingredients. Sure, we could add it to Enchanting, but for balance reasons, it would probably have to be accompanied by a varied list of other ingredients...