It's such a small thing but I can't stand having the output of a cell evaluate above the cell. I get that it's part of the Observable reactive environment, but it breaks what we're used to with the command line and other notebook applications.
I agree, it's confusing enough to make the whole reactive concept less approachable. It'd help if the output didn't look so much like the cell itself, but it's not entirely clear how to differentiate them visually.