I'm talking about the fact that there's only one Alt Gr, on the right of the spacebar, but many characters behind an Alt Gr modifier on the right-hand side of t

I'm talking about the fact that there's only one Alt Gr, on the right of the spacebar, but many characters behind an Alt Gr modifier on the right-hand side of the keyboard. You can't type any of those characters using the correct form for touch-typing, which is to hold the modifier key with one hand while pressing the letter key with the other.