I think it was interesting since its an optional path.. and to be honest knowing hags it probably screws you in some ways later...You still need to either give something up or pass a check to get it. While you don't know the long terms consequence for it you do know the immediate ones wich with the tadpole honestly all we have is speculations nobody the the dev know right now. I honestly would like to see something similar done for a good decision.. lets say you take on a super hard fight to protect somebody then later get rewarded a blessing...there is a captive thats about to get thrown to the spiders in the goblin camp that you can save if you act fast enough.. as far as I know you get nothing for it..maybe some xp or an inspiration point (I think maybe not even that). Pathfinder games had alot of things like that.. choose a particular path you get benfit A choose the other you get benefit B.
But to the back to my point from the main feature of the game I think leaving somekind of suspense on whenever its good or not to use the power to be left a mystery is a good thing. Like I have pointed out before you could never use the tadpole then it grows anywways if you decided to drink Omeluum's potion..drinking the potion is not exactly evil temptation nor is it good. You get the ring of psionic protection in exchange.. I am curious how important that ring might be later for either path.