if you limit the use to only the shelly I'd agree but sometimes a camera or nvr solution near your cabin isn't rare.
certainly given the formfactor of the switch i linked, I found the explanation of shelly: 'it can't be done at this size' very strange.
the unify hardware would fit in the shelly housing with little effort.
also sometimes a switch is just used to daisy chain to another switch f.e. ->
i have a UTP cable up to my garage this connects to a unify switch in my electric cabinet and continues to another switch near the cnc and plasma cutter,
thus that whole switch is now limited to 100mb if i were to daisy chain.
plus allowing poe would in case of belgian law not only reduce the nr of wires in the cabinet but also the switch needs a another fuse as well..