Alright; I don't know what's supposed to be ugly about my staircase, but then I just won't move in with you. ;-)
You can't argue about taste, which is a good thing. Yours is different from mine and I/we don't like arches.
Rational view: It's too playful for me. I like clear edges, whether in the house, the car, or in patterns. A glass arch would break with the entire interior design and style of the house.
Best regards