I know the majority of scholars accept weak Hadiths for virtues bearing in mind certain conditions. However my question is regarding why weak Hadiths are also used for those things which are not related to virtues. I am confused regarding the wiping of the face after prayer, from what I have been informed is there are many weak Hadiths on the issue, however the wiping of the face isn’t virtuous.
So why would weak Hadiths be accepted in this example and others like it. Could you also direct me to any books where this is clarified.