question #3 Sahih Muslim 962b, Book 11, Hadith 105 : What can be inferred about the flexibility of practices related to funeral rites in Islam from this narration?

Verily, the Prophet (ﷺ) used to stand first but later on kept sitting; but it is also narrated that Nafi’ ibn Jubair saw Waqid b. ‘Amr standing for a bier till it was placed down.