It occurs to me about jetpacks...

[dewline]

...that I'm probably safer living in a world like this one, where such things are very rare and unskilled users aren't crashing themselves into shopping malls, office buildings, apartment towers and so on.

Much safer.

I'd still like to see those permanent settlements on the Moon, Mars and in the L-4 and L-5 points between Earth and the Moon, though.

Smartphones are filed under "nice to have while I wait for the space settlements".