your comparison is wrong, splinterlands is about the tactics of which card is placed where, so the tool takes over the entire game. not like leage of legends where a tool tells you the meta but you still have to play the game yourself....
and yes it is degrading, if it is as easy as it is presented why does he need a battle helper to keep up?
so is chess not competitive either because you just place the piece correctly and then miraculously the opponent's piece is defeated and flies off the chessboard?