This board needs some supporting hardware that RPi doesn’t - a fan and wifi antennae, if I remember. Radxa includes these with a case as well, so the added cost

This board needs some supporting hardware that RPi doesn’t - a fan and wifi antennae, if I remember. Radxa includes these with a case as well, so the added cost is trivial, but at that point the footprint’s more than doubled. (That’s not to say that this isn’t preferable; just that it makes different trade offs that in some cases don’t work.)