I agree with @KuroKuma, the dependencies are strange. I see myself forced to have a higher compass range.
Also I agree with @Heurazio. I guess the xp+ in the end of each skill line should result in a benefit for someone who chose his path. If I want to be a dealer, I invest much in tax decrease. On the other hand (as you also introduced @luke-turbulenz) I assume, that points necessary to achieve higher skills increase.
So actually, when I have my first tree done, I guess I am very far with my used up points and cannot aquire much more... so what for faster experience gain?
Either put that skill together with a level 2 or 3 skill so that 4 is achieved faster... or I'd probably not skill it.
So far I am still missing skills suitable for explorer! What is with higher view distance? Faster movement speed? nothing about location markers also!
What is with Oort reading? Is that even a concept still? or is everyone able to read who can use boundless wiki?
What is with machine wear? (Edit: I oversaw durability) Why not have a skill in the "machine line" that reduces wear off or an ultimate ability that you can reduce wear by 50% every 180 minutes?
Some very innovative concepts of boundless are respected too less i think.
I also miss skills which play with elemental powers. Weapons, Armor, tools, machines, engines should benefit from it.