There are a few trees that seem specifically designed for players to take them and buy down to the Dedication talent and then drop them, specifically Assassin (BH), Gadgeteer (BH), Doctor (Col), and Scoundrel (Smu). Each of these talent trees has a direct path straight down to the Dedication talent filled with 80% or higher abilities that are permanent.
I don't know if this is a design intent or not. Personally I am not a huge fan of this idea, of encouraging people to add and drop trees to min/max their character. Granted that whether or not it is encouraged or designed that way will not stop people from doing it; and I do like that you can be selective and build a completely unique character based on what you like this idea stil irks me a little bit. I think the dedication skill should be at an equal spot on the trees and should have some balance on what abilities you pick up to get there. Running straight down one line and picking up all permanent abilities shouldn't be possible. There does need to be some cost for constantly shuffling specializations around.
Just an observation and my two credits.