Etiquette of the Rows: Between Obligation and Recommendation

Question:
Honorable Shaykh, may Allah grant you success, he says: You mentioned, may Allah preserve you, a number of rulings regarding forming rows, and you stated that this is among the etiquettes of the rows. Does that mean they are not obligatory, but rather recommended?

Answer:
My brother, some etiquettes are obligatory and some are recommended. Consider this among the obligatory etiquettes. The fact that it is called "etiquette" does not mean that everything is recommended; no, that is not necessarily the case.