A weakly authenticated Hadith is acceptable in issues of excellence
All the Hadith experts are in consensus that in matters of excellence (Fadhaail), a weakly authenticated Hadith is to be acted upon. Thus, Imam Abu Zakariyya Mohiuddin Yahya Bin Sharaf Nawawi (May Allah shower His mercy on him) has clarified this at various places in his writings:
Translation: The scholars of the Ummah all hold that it is permissible to act upon a weakly authenticated Hadith in matters of excellence. (Sharh Al Arba‘een An Nawawiyya, Muqaddima, Al Majmu’ Sharh Ul Muhadhhab)