I've been down this road. I don't know what it is, but many web developers are extremely adverse to doing it. Even once you've convinced people to let you do it, the first PR from a new hire is a fix for this "bug".
As I understood the answer, the expanded version would be "the only disadvantage is having to spend an unreasonable amount of time arguing about this issue, which will drag on forever since it is relatively minor."
I've been down this road. I don't know what it is, but many web developers are extremely adverse to doing it. Even once you've convinced people to let you do it, the first PR from a new hire is a fix for this "bug".