I think one reason is that philosophers are more insecure to speak accessibly because non-philosophers are skeptical that philosophers have any special expertise. After all, all people - not just philosophers - have attitudes and points of view on various philosophical questions, and they rather resent being told that there are professionals who can think about these things better.
Rebecca GoldsteinIn order to refute a conclusion, you have to put forth the best possible argument for it.
Rebecca GoldsteinPlato worried that philosophical writing would take the place of living conversations for which, in philosophy, there is no substitute.
Rebecca GoldsteinHow can those who possess all knowledge, which must include knowledge of life that is worth living, be interested in using knowledge only for the insignificant aim of making money?
Rebecca Goldstein