It's one thing to speak to employees, but I personally have a problem with people feeling they're entitled to my medical history because I pre-board a plane for example.
I understand that having a service animal brings attention as well as expense, and a whole host of other issues. It might help some become more functional.
I've considered it for various reasons over the years, and don't think it makes sense for me at this time. But when I was forced to spend more time in public years ago when I was raising my son, it would have helped...