My experience matches that.
While climbing most deadly accidents (30+% of them [1]) happen because people rappel through the end of the rope (or ropes if using half/twin ropes). Stopper knots are a 10s precaution that is often overlooked.
However, it is true that on easier climbing routes it is easier to hurt yourself because you might hit a ledge on your way down. If that happens it's most likely the belayer's fault because he/she should keep "a tight leash" on the sections just above said ledges. If you let an unexperienced person belay you I assume you evaluated the risk and are ok with that.
[1] https://www.ukclimbing.com/articles/skills/8_common_climbing...
>little injuries sliding down a shallow wall
Those are often not "little" the rocks rip you apart, and when you stop you look not human anymore (a bag of flesh)...happens often at glaciers too.
Not for everyone obviously.
https://en.wikipedia.org/wiki/Via_ferrata
And if without securing...even a bigger objective danger for you to decide if you can do it, that's the point.