[Greylocks]

Then I will answer from my point of view.
By the time it can break the average modern glass, an airsoft gun would be over the limits set by most places.
What may not have cropped up in your reading is that most areas require an upper limit of 400 to 450 FPS for outdoors, and as close to stock power for indoors.
As you can see from my SIG picture, I just wear a T-shirt, goggles, hat or scarf, and sometimes a BDU jacket if I need more pockets than those already on my pants.

Does it hurt? Yeah, some. You dont really want to be hosed down. But there are field rules about that too.

Damage? Expect that you will have scrapes and welts, maybe a bleeder if you get hit in the scalp, the face or the hands.

I suspect that paintball would hurt far more.

I am glad you understood how all this looked, because I am not mean on purpose. Just blunt as a brick. What I point you to really is a good way to learn more in the shortest possible time, plus it's a lot more fun.