Single child versus multiple child, family differences

We have one son who is six years old and a few of our friends have multiple kids.
We don’t notice a ton of differences, but I feel like there are differences I can’t identify but maybe parents with multiple kids can.
My friends with multiple kids say things like “ they’re just used to conflict more cause there’s another person they have to work things out with or fight over toys with” which makes a lot of sense.
What are the unspoken things that parents with multiple kids experience that there would be no way for a parent with one kid to experience?
Maybe not experience, but there has to be more differences and do parents with multiple kids judge single child homes?