Telling people to "calm down" always has the desired effect. It is known. ๐
We have casinos at home. What happens in Moose Jaw, stays in Moose Jaw.
The roof in the picture isn't just gravel, it's got fist size rocks in it as well. Gravel alone I could understand.
Obligatory dik dik pic.

Here's me thinking it's because they can change their molecular density at will, which is why a 12 pound cat sounds like a 600 pound Shetland pony when it's galloping through the house at night.
Not in this part of the world though.
You would think the tar would ooze downward on very hot days. (Yes, we get them here.)
They probably could use shingles, there are plenty of surrounding houses with about the same pitch that do.
This is not a flat roof though, it's sloped.
When our cat was spayed, I modified a newborn size onesie to dress her in. She managed to wiggle out of it even while sound asleep. Getting out of this costume would be a piece of cake for her.
I wonder how they get them to stay in place. It's not a steep slope, but it's definitely not a flat roof. So far I have resisted the urge to ring the doorbell and ask about the roof.
Dad was a Nazi. I guess it never occurred to his daughters to take the painting down when the realtor came in to photograph the house.