Sorry, i'am not a native english speaker so I'am not sure i get you.
So you are telling me I should not use tilemap to make my level?
In fact tilemap soud only be use to decorate the background if we cannot use it for the different element of the world game?
For exemple here i'am trying to makke a sokoban game. I have all the diferents elements on a tileset (the players, the walls, the box...)
It's not the right way?