Deletion of Unsolved problems in medicine 2

Comment: There are Unsolved problems in|seven other articles of the same sort; some with less content that the medicine one (e.g. Unsolved_problems_in_biology|biology); are we absolutely confident that the article could not be improved to the standard of, say, Unsolved problems in physics?  Unless we are, this shouldn't be deleted.  Also, it seems to me the reason given for deletion is rather weak: practically every article on Wikipedia has to contend with the problem of what is major (i.e. worth of being in an encyclopaedia article) and what isn't, the fact that an arbitary line has to be drawn somewhere doesn't mean the page should be deleted.  Most articles are "open...  to POV bias" as well; but then that's why we have 
Stance: comment
Cited policy: Wikipedia:Neutral point of view (WP:NPOV)