I think I’ve figured out why George Lucas insisted that Wookiees and Hutts should not be allowed to be Jedi in the old (Legends) EU.
Namely, as a punishment. For the transgressions of certain members of their respective species.
If all Hutts are the size of Jabba then I can understand the thinking behind it but not Wookie’s as they’re humanoids.
It’s not the size of the Hutt, it’s the motion of the sail barge.