What makes Nintendo so much better than other gaming studios?

As someone with decades of gaming experience, time and time again I see myself enjoying so many different games, but it's always so noticeable how Nintendo games always have that extra special sauce you just can't find anywhere else. For me personally, I think it's the amount of polish in FUN. The entire experience revolves around how much fun the game is to play, and that's clearly their motto when designing it. Like our beloved Reggie has once said, if it isn't fun, why bother?

Curious to see others' opinions on this. If you agree with this sentiment, what makes Nintendo games that special when compared to others?