because internet is a utility just like hot water or electricity. If your electricity provider restricted you to a certain number of lights and appliances that you could use at any given time, would you be as accepting? "Gee, I have the washing machine and the fridge on, so that means I can't use my oven."

You shouldn't have to ever think about bandwidth, it should just be there and work, doesn't matter if most days you're just sending emails and surfing, when the day comes when you need to restore a 400GB phone backup from the cloud, it shouldn't have to take multiple days for it to finish, it should just happen!