I mean its up to the community if they want these effects added to old maps though i cant think of too many places on old/original maps where they would make logical sense, for example making the water in prison and on island slow you down comes to mind.
Fun fact, i snuck this into the little touch up i did on my island temple map without mc knowing about it, the fire actually burns you if you stand on the fire places and walking in the water slightly slows you down or at least it should now.
It is slippery but the example in the exhibition map is merely reducing the friction which ends up being "slippery ground" so its not an "ice" element or whatever applied it just ends up feeling that way.
The prefix "command" for it doesnt allow for modifying gravity to alter jump behavior, at least currently, idk if MC wants to further expand and improve the functionality this way.
Thats just the damage i gave that section to (literally) wall off players and force them to go below to encounter the conveyor belts, the damage is fully customizable from 1 to 9999, this goes for all 4 elements as you can read about in my thread i made for aspiring map makers to take advantage of and learn.
At least the way it is currently set up and works this is not possible but again its up to Mc if he wants to expand and improve on the features in the future.