I have this theory about enchantments and potions. And this seemed like the place to tell others about it without starting some stupid ass flame war on the minecraft forums.
This whole potion, enchantment, and ridiculous End dimension are for the other platforms. Mojang wants those other platforms bad. It equals big, quick cha-ching with minimalistic effort. But the one big, amazing, makes the game worth playing, option is mods. Well if you are a player on the Xbox 360 you can't get player made mods. The option simply doesn't exist. I remember this from Elder scrolls: Oblivion. I had friends that played it on Xbox while I had it the PC. I would taunt them terribly, "Did you get that amazing new sword, quest, armor, etc.? Oh yah you didn't cuase you play on the Xbox." Well it's the same thing here. And that's why the potions and enchantments feel like slapped together mods. Cause they are. They're a bone Mojang is throwing to a whole community that is left out in the cold. Those jack asses playing on the wrong platform won't know the glory of IndustrialCraft, BuildCraft, Mo' creatures, Red power, and on and on the list goes.
So take heart my crafting brethren. Don't worry yourselves about this ridiculous additions. We can mod out the crap we can't stand, or change it, or whatever. It's the other users that don't know what they are missing.
Oh, and my two cents for what to do with the XP. How about a 'cloning' chamber to make mobs. And you have to infuse them with 'lifeforce' you gathered from other mobs in battle. That happen to take the form of those orbs. Just an idea.
Damn. That turned into quite the post.