Gui will help adoption period there are no arguments that are sound against that.
I disagree completely. There are plenty of reasonable arguments against that, the biggest of which is that a bundled GUI will do nothing to attract adoption outside of the cryptosphere, and almost everyone inside the cryptosphere is already aware of Monero and can use it if they want to.
A GUI by itself will do little for adoption.
Let me link Grandma to anything other than a official supported easy to use GUI and see what happens.
BTW when you answered for me the other day you were spot on. thx