Even when you take trading into account do you really want to be ordering in caravans of nothing but metal? That'll be expensive...
I'm sorry, what is this "expensive" you talk about?
As long as we have infinite resources in the form of glass, ceramics, and stone crafts, which recieve massive bonuses to price in the form of quality bonuses, there will never be a time where we need fear "expensive" base metal bars.
Yes, they do, if something falls on them from above it'll be stuck there until deconstruction.
So fortifications block line of sight downwards, then?
You can build guard towers that work just fine at shooting down a z-level onto the goblins below. I'm not sure how much line of sight is blocked when building towers more than one z-level higher than what you are shooting at, but going further than one z-level is not necessary.
You cannot tell which metal/s there are.
But if it is "metals" instead of just "metal" there is more than one kind of metal on the map.
And nope, deep metals means exactly what it says...metals deep down there.
If you donīt also have shallow metal/s you wonīt find anything within the upper layers.
I hope Toady implements "Coal" as another piece of information
in one of the next releases.
It would be really useful to know whether there is coal at the embark location or not.
Actually, from what I understand, it's worse than that - "metal" refers to
anything that isn't a layer stone. I embarked on "deep metal" and found only useless brown jasper.
Microcline is a "metal".
Worse, just do a site finder search for sites with no deep or shallow metals, and half the world will light up. Those are sites with no metals, gems, or even microcline in their layers whatsoever. Literally nothing but the layer stones and soils.
Yes, some sites have plenty of the most important resources, but having microcline be so rare that only 5% of the planet has access to it is just absurd.
That said, Toady is already changing things, so it shouldn't stay like this for more than the next bugfixing release, anyway.