Except for the rules which players use and NPC's don't, such as classes, levels, death saves, inspiration, etc. 5E expressly acknowledges that PC's are different. Not to mention the biggest one, that NPC's largely operate by DM fiat. Unless you're making individual rolls to see if they fall in love, persuade one another offscreen, etc. Possibly JMISBEST does that to determine which of the suiters the 8th step niece of the king prefers, but I hazard a guess most don't.
Have you ever had a PC roll to see if they fall when walking down the inn stars out of combat? Or have Parkinson's? People do this all the time. You're already filtering the world through a dramatic and heroic lens. They don't have to roll to see if there are important events taking place near the PC's. The DM is already orchestrating that to ensure important events happen where they are at because otherwise it's a dull game about cobblers and farmers going about their routine lives in a quiet village where the biggest issue is the Lionel Pritcherd and the Wolfington brothers painting a cow, what most NPC's in the game world experience.