Effect Of Etiquettes On Salah
As a one-liner principle, etiquettes do not affect validilty of Salah from a legal stand-point. But since etiquettes are an integral part of us humans in every social spehere, therefore, it is difficult to assume a situation where such etiquettes are neglected by human beings intentionally when it comes to their relationship with God. Therefore, sometimes to portray importance of such etiquettes for humans w.r.t their relationship with God, the same statement is said with some caution. Please also refer to the following response by Ghamidi Sahab : Discussion 31359 • Reply 31709
You can use your discretion, but that discretion should have some sound basis in your head. For example, in formal setup, would you meet people or your boss with folded sleeves? One should consider all these factors before using discretion w.r.t etiquettes in front of Al-Mighty. But these are still etiquettes which will not affect legal validity of one’s Salah. There’s no need for Sajda-e-Sehaw in this matter. But if you one wants to do Sajda-e-Sehaw for their satisfaction, then there’s no reason to stop them from doing that either.