The whole reason for Disney being given those things in the first place is because FL was behind the times, not up to par in certain areas of expertise for what Disney was doing.
I give you Spaceship Earth, built in 1982
It left FL quite clueless as to how or if this and the many other things Disney was doing could be permitted so for liability purposes, they said; Here, we'll give you full regulatory rights but also full liability over it. Have a city but sign this waiver first. It's you're baby now.