When choosing passives in the Skill’s tree, there should be a visual indicator that shows nodes that will be unusable with the one you are going to select:
Furthermore, if a passive in the Skill’s tree does not work or cannot stack alongside the ones you have chosen it should be greyed out or darkened in a way that expresses that.
I would be happy if granted skills/skill effects that benefitted from other skill trees were more clearly pointed out. Bear-form swipe for instance (not sure if it mentions using swipe skill tree now, but seem to recall it not in the past). Spriggan pet summon vines and spriggan-form summon vines is a current one (pet vines do not benefit from form vines skill tree).
Also, more clarity around buff/aura effects. Spriggan pet healing aura has a node that grants a dmg buff. The healing aura can be modded to affect minions, but they do not also get the +dmg buff. This kind of interaction limit would be nice to have clarified.