(can't see how they can climb, run, or pretty much do any adventuring activity, to be honest).
The same can be said for many droids too.
True, but the droid will (probably) at least be able to move under its own power on normal ground and would be easier to lift up than a Hutt. Anyway, if people like the idea, then great - I could have done without them as PLAYABLE species (this is a bit too alien for my taste).