Would you prefer self contained games that always have a happy ending, but then for the sequel a cult forms to resurrect the previous badguy, you find out there was an even bigger badguy the previous one was working for, or an evil apprentice decides to take over the plan for world domination / destruction? Whether it is time or circumstance, if you save the world, something has to undo all your previous work if a sequel is to allow you to save it again.
I had lots of malachite gems (reloading at each of the veins), but didn't bother with level 10 enchantments (other than a few healing auras throughout the game) since the level 9 enchantments offered almost the same effect. I do think each malachite vein should have at least 1 gem, though.