The difficulty is that the search function is difficult to use. In particular, keyword search is difficult to use. For example, if you search for a specific word, you expect that only the page where that word appears will be hit, but if you do a keyword search on this site, there are also pages where that word does not appear at all. I think it will be a hit. On the contrary, I think there are cases where the page does not hit even though the page should contain the word. There may be a misunderstanding here, but anyway, the impression is that the search function is difficult to use.