1. In our case, too much distance with too many costume pieces and too little time. We are off in a wing with no classrooms or bathrooms, which is why we have a two stall bathroom of our own. It's sometimes barely feasible as it is to make costume changes in time. We have been at contests with coed teams and they get an extra room for the boys, but that means a disproportionate number of girls squeeze into another room or they pay more for the extra boys' room.
2. Apparently, gender neutral bathrooms don't satisfy the Dept of Ed if you're transgender, but only if you're not. To me, it's a practical numbers issue. In a school our size, the number of modest "I'm not comfortable changing in front of the opposite sex even if they are transgender" students would likely outnumber the transgender students the government now says can't be made to use a third gender neutral changing room. Possibly by a long shot. Schools do not have the money to solve this mandated problem. It really wasn't thought through, and certainly the comfort of all students wasn't considered.