also, enemies that are healed by an element, but do not bleed it have no effect on elemental ranger in that case, since then u have full control on what u want to place under their feet.
I dispute this, as a lot of different reactions and interactions can create surfaces. Enemies can create surfaces as well, elementals dying creates a surface, etc. Sometimes a character who can create or negate a surface has another urgent use and can't. Surface creation is not always under "full control" of the player.