You are right, but a successful GUI could still allow for empowerment and customization. I admit my Quick-start sequence even is customize for myself.
As for fairness, as pointed out earlier by @Kampot, you can't make it a too serious goal, you wouldn't force everybody to play with the smallest screen resolution or to set everybody's mouse to the lowest dpi. (I agree to most of what you say, you have good points, but I still don't come with your conclusions)
The more powerful the GUI, the less a bot has speed advantages over a player. So I can't agree on your approach on this.
Anyway, I wanted to see if it was worth working on my mod just for me, or to work out how to make it good for other players that wished to have something like this. (Hence making the thread title click-bait) I see I was alone wishing for theses features.