This quote is suggesting that Alain Robbe-Grillet, while a skilled writer, primarily appeals to the "comfortable bourgeoisie," or the middle and upper classes who are secure in their economic and social status. Sartre is implying that Robbe-Grillet’s work may not challenge these readers to question their circumstances or the status quo, but rather reinforces their existing perspectives and comforts.
The idea of a writer, artist, or other creator speaking to the "comfortable bourgeoisie" is still relevant today. It’s a critique that can be applied to any work that doesn’t challenge the prevailing social order or that primarily appeals to those who benefit from that order. For example, a blockbuster film that doesn’t question societal norms or a pop song that only celebrates material success could both be seen as speaking to the comfortable bourgeoisie.
In terms of personal development, this quote could be seen as a call to seek out and engage with challenging ideas and perspectives, rather than sticking with what’s comfortable or familiar. It suggests that growth and progress come from questioning the status quo and considering alternative viewpoints, rather than simply reinforcing existing beliefs and biases. This could apply to anything from the books we read, to the people we surround ourselves with, to the media we consume.