Like Kavan said, this is par for the course. If you want to hear the potential negatives of one procedure, find a doctor that prefers an alternative and find out why he/she doesn't like performing that other one.
It's like my PRP doc who thinks hair transplants essentially suck, as he explains on his website, and that his PRP treatment is often times superior. Then you go along with him and what do you get? Even less hair than you came in with! That doesn't mean that'll always happen, but you have to be careful in figuring out what the motives are of the people writing these research articles or whatever. If they're dentists, expect them to advocate procedures that make them money, downplaying the risks, trade offs etc..
I already knew this going into my PRP doc, but I was a little too desperate to avoid a hair transplant, and was also extra stupid for jumping right into the procedure as the same day as the consult, albeit with the expectations he set for my particular situation...