I don't dismiss anything.
You just did.
You are saying "such is the cost of living in an inclusive society", but you aren't actually acknowledging the cost.
Actually try to visiualize the locker room of tomorrow, with enhanced privacy. A person must walk in in street clothes, change clothes to exercise clothes, store the street clothes, exercise, return, remove all clothes, storing both exercise and street clothes, shower, and dress in street clothes, and then either store the exercise clothes for their next use, either at the permanent location as is typical for high school settings, or in a gym bag to be removed for home. Don't forget that all clothes have to remain dry, except of course for unavoidable sweat on the exercise clothes.
Now, visualize how to do that in a traditional locker room and in an enhanced privacy setting such as you advocate. See the differences.
Simply put, gym class as it existed when I was in high school could not exist if the enhanced privacy locker room was a requirement.
And....maybe that's something you think is ok. However, what it means is that, actually, the cost of an inclusive society is that no one is included. At least everyone is equally excluded, and some people seem to think that's an improvement.
In reality, a lot of people simply choose to deny the actual consequences of the changes. They say "such is the cost", without acknowledging the cost.
Making accommodations for minorities is often inconvenient. Such is the cost of living in an inclusive society.
I recall much grousing about the requirements of the ADA for example. Making sure people with disabilities can access society is often an inconvenience to the able-bodied, often coming with considerable additional expense. I suppose what is "reasonable" is a judgement call.
Interesting analogy. Analogies often open up rabbit holes for derails, so I won't debate the ADA here. I'm mostly for it and I think it's mostly a good thing, but I find that an awful lot of advocates don't acknowledge the actual costs, which go beyond mere dollars on a ledger sheet.