What qualifies one to count as a philosopher in your opinion? I don't know about Camus, but I'm pretty sure Sartre has produced at least as much purely philosop

What qualifies one to count as a philosopher in your opinion? I don't know about Camus, but I'm pretty sure Sartre has produced at least as much purely philosophical works as works of literature and is universally considered one of the most important philosophers of 20th century. The nonexistence of absolute free will does not make it a useless concept just like the nonexistence of "absolute" solid bodies doesn't make "solid body" a useless concept.