In my reading of Descartes's Discourse on Method, I am fascinated by his project of universal doubt and the promise it seems to give to eliminate the many presuppositions we have. However, it seems that Descartes meant whatever belief one has is not justified if it can be subjected to any doubt, including skepticism. Therefore it would seem that answering skepticism should be among the priority in philosophical research. But this is a very strict requirement - is it the case in current philosophy research? If not, how do philosophers justify not making it the priority?