> You can’t really fill org tables, each cell in a org table can only have one line.

Hm, I can add hlines via org-table-insert-hline and I can «fill» cells using org-table-wrap-region. 

Unfortunately this function is a bit cumbersome. 

I did however an experiment. 

I started with a org table, that I wanted to «refill» converted it to
emacs TABLE using org-table-create-with-table\.el used your command, and
than re-converted it to an org table.

Worked like charm.