"I am pointing out that treating people differently damages teams."
Not really. Sing happy birthday quickly during a meeting for folks that enjoy it. Skip over for the folks that would really rather one didn't. Adjusting for a sickness or disability isn't any different.
Most of the time, it boils down to things like giving the person with crutches a little extra time to use the toilet because it takes more time. I don't really understand why this would be an issue for you since, if you had crutches, you'd be treated similarly.
The same as if you developed migraines and were able to work from home a few days a month. More often, however, migraines are likely to be covered by FMLA (in the us) and the person gets time off for a certain amount of days.
If you truly think this stuff is unfair, I urge you to talk to your elected officials and complain about non-able bodied folks getting some special treatment and I truly hope you don't become disabled in any way afterwards.