To be fair - I think it probably has something to do with locality and where you live, too. My grandparents had a two-car garage. In both garage doors, they had three windows, and yes, the doors were roll-up types.
They also had a small door entry on the side of the garage, and that had a window in it.
And the south wall of the garage had two small windows in it as well. My grandparents ended up removing those extra two windows eventually, after some kids broke the glass playing baseball in the street. So they just got rid of the windows altogether and boarded them up/built over them somehow. I was little when that happened, so I don't recall exactly what they did to get rid of the window frames.
The windows on the roll-up garage doors, my grandmother did make like a small curtain for. They mounted rods and had the curtain basically attached to both the upper and lower rods so it didn't move, and stayed in place when the doors rolled up. But she put those onto the garage windows when I was about ten or twelve because at that point, they had begun storing other things in the garage and she didn't want the whole area to be able to see what was in there. Out of sight out of mind of thieves was her opinion.
But yes; I have seen windows on garage walls, and roll-up garage doors before as well. The apartment complex that my mother lived in when we were kids also had windows on the roll-up doors, though we did not have windows anywhere else in the garage. So yeah, it does happen sometimes.
I'd say window or no window - entirely up to you, Earl. It's your product, it's your model. Do what you like.