“We see that the fact the Tamar covered her face is considered praiseworthy by Chazal.”
Theoretical question, on this statement and similar ones-
Does the fact that chazal make a note of someone’s behavior as praiseworthy imply that this is something that is a lesson for everyone, or is it the opposite- the comment is made since this behavior is out of the ordinary (e.g. if this was the accepted behavior to cover one’s face than there would be no need to comment on it) and therefore not a recommended practice for the masses, even if it was appropriate for this person at his/her level.