Why are there 5 traceries for the yellow tree skills, 4 traceries for the red tree skills, but only 1 tracery for the blue tree skills?

Then to make that even worse the 1 tracery for blue tree is Inner-flame offering a healing boost for you and your pet if you trained the skill.

Should I assume SSG's has future plans to kill the tree? It just feels like that's where things are headed.

A blue name response would certainly be appreciated.