I believe it is the developer's responsibility to create the game however they wish it to be experienced. Then, it is up to the players to judge whether thegame is good or not. If they don't want kiting or kill experience than it shouldn't be in the game. It is really the developer's only responsibility. This is like asking is it the director's responsibility how people see a movie. It is basically their whole job.
Also, removing kill xp doesn't disallow getting stronger. Side quests allow for extra experience to become stronger and make things easier.