For the tiny percentage of people who are negatively affected by our embracing of standards, they can just get their sports somewhere else in the meantime. It's not like we're denying them hospital care.
I don't start with a design objective, I start with a communication objective. I feel my project is successful if it communicates what it is supposed to communicate.
If I was designing a web site for elementary school children, I might have a much higher percentage of older computers with outdated browsers since keeping up with browser and hardware technology has not traditionally been a strong point of most elementary schools.