You call "Being and Nothingness" Sartre’s "Most important work." In doing so, you have either overlooked or considered not worthy of mention Sartre’s "The Critique of Dialectical Reason," a much later philosophical work and one that supercedes and/or expands upon further many of the ideas found in "Being and Nothingness." Many serious students of Sartre consider "The Critique of Dialectical Reason" to be his most important philosophical work.
You call "Being and Nothingness" Sartre’s "Most important work." In doing so, you have either overlooked or considered not worthy of mention Sartre’s "The Critique of Dialectical Reason," a much later philosophical work and one that supercedes and/or expands upon further many of the ideas found in "Being and Nothingness." Many serious students of Sartre consider "The Critique of Dialectical Reason" to be his most important philosophical work.