My sentiment exactly. If there's no mechanical enforcement, why doesn't the DM just narrate as they see fit?
I do have one quibble with the dialog, though:
I would not narrate that way, because it is telling the player what their character's experience is. I would just narrate what the NPC actually does.
I try really hard to keep the character's experience out of the narrative, and restrict myself to describing the environment.
Instead of "You see..." I try to say, "There is..."
Instead of "You feel the sun shine on your face" I try to say, "The warm sun shines down"
Instead of "He startles you with his sudden appearance" I say "He springs out of nowhere"
I still slip up a lot...it's hard to remember to do this. But I'm still practicing.