Note taking isn't a skill worth having. It's ridiculously banal. As for concentration, having it as a skill denies individual variance. Some people do it better naturally. It ain't because of practice.If you want a concentration ability, have it as a personality trait that is subject to change over time.
And yet practice is part of the equation. It's a black-white fallacy to say that it's due completely to one's inner disposition.
On the other hand, that means we'd have dwarves with lousy self-discipline but somehow a flawless ability to concentrate. How do you reconcile that?
They have ADD. They're good at ignoring distractions they cannot control, but lousy at not letting their minds wander to other subjects of their own will.
And it's not an inappropritate comparison. You see, that is exactly how skills work in Dwarf Fortress. If he does the same thing over and over again, he will always be better at it than anyone else.
Unless everyone else is
also learning the material, in which case the outcome is more open to debate. Not everyone learns woodcutting in DF. The difference in skill among dwarves is due entirely to how much practice they get at it, just like in real life.
You also have not answered my point that someone who takes four years to learn material others learn in one has
below average learning ability.
That's all well and good Ninja, except none of those things actually happen in the game. They're not even abstracted, there is no cover benefits beyond total invisibility behind a bush. Your spotting skill is seeing someone walking towards you on a suspension bridge and failing at it because you're only level 2! hurrr.

So gobbos and kobalds have cloaking devices, huh? Honest-to-goodness cloaking devices that only fail if you run headlong into them? That's not an abstraction?
Also, creatures that aren't intelligent cannot become good at spotting and are always lousy at learning. This includes dogs. You see what my damn problem here is?
Dogs don't actually see too good, and our taller stance gives us a larger range to see things. We have a better chance at spotting things than a dog, at least during the day. While dwarves are short, they stand taller than the average dog, so dwarves have a range advantage over dogs. Furthermore dwarves can see in the dark, so their advantages are preserved at night. Dogs would rely cheifly on other senses to detect intruders at distance, like smell and hearing. Dogs being bad at visual spotting is
entirely appropriate.