Don’t get me wrong, if you have a good jam or preserves it’s totally fine on a sandwich, and I wouldn’t turn my nose up at it. However, peanut butter doesn’t really need the help, and the extra sweetness from jelly is totally unnecessary. Toasted bread and peanut butter is all you need for a quality simple sandwich.
I’d say toast with jelly is definitely a breakfast staple, though.
But also I think hot toast with peanut butter on its own works very well.
The main issue with peanut butter is the stickiness, and the smacky mouth you get, but if it’s the right temperature it will be more runny and soak into the toast.