"Think of it as the difference between throwing a rock and a similar weight of gravel into a pond."
This is drivel.
I spent a large portion of my lunch hour throwing both rocks AND handfuls of gravel into the round pond in Kensington Gardens until a police patrol car hove into sight at which point I decided to be a) discreet and b) save our brave boys in blue considerable paperwork and legged it.
At no point could I discern any difference in distance of throw or size of ripples at the pond's edge between rocks and gravel.
I have a feeling that goes for 5G as well.