In any case, Abnett and Lanning didn't do much for Groot's character development except have him keep hollering "I am Groot." Eventually, once Marvel's cosmic resurgence started to go off the rails with the "Realm of Kings" event, one of Inhumans popped up with the revelation that the repeated "I am Groots" was a distinct language that could be understood by texture and nuance and cadence of saying the same darn three words over and over.
I thought that was a lazy way of explaining a lazy way of characterization. DnA, to be kind, were pretty much overwhelmed running Nova, Guardians and the cosmic event stuff, so maybe they had to cut a corner. But the best Groot is the one Griffen wrote in the Star-Lord mini. A tree of few words, but not nearly as few as just "I am Groot."