The “I’m Obliged” response sounds better than what I usually hear “No Problem!”. Who said it was a problem? I don’t fret over it much, but I notice the subtle shift of what passes for an acceptable demeanor. Less humility, more casual to anybody, regardless of who they are to you.
“no problem” is actually widespread - in spanish “de nada” means “its nothing” similar in italian “prego” and in greek i think.