It has magma.
Also inaluct, Saying there's a right or wrong way to play it is playing the game wrong.
I think this game qualifies as being on the edge of sandboxlyness. (Mind you it's also on the edge of godliness [Re-ordering the dwarf skill list would tip it over]) Also, I take out Alunite because it is pointless and doesn't even hinder my process. ALL it changes is the color of my walls, and crafts. As for the point you may note that Obsidian is worth more so I'm making a profit from not having any alunite, I get enough obsidian to supply my crafting anyways, and I just dump/forbid all my alunite. (And microcline and other useless stones)
As for the wiping of saves I do, I'm still rather new to playing this, so a pit in the middle of my fortress isn't good for me. I saw the 20 or so creatures, and my mind went to "I'm screwed, lets give up" (Before I gave up I was already attacked by a few giant bats) not; "Lets build a giant wall blocking it, and then later use it to dig in and make homes!"
As for symmetry, I'm a bit OCD about video games, and even-more-so symmetry.
So, if you don't like the way I play, don't bother wasting your time telling me, because I play to have fun, not to do everything perfectly correctly.