Unless I missed something in the game, all those swarm enemies can do is perform a head-on basic attack or dash. Basically a goblin who could use a consumable or throw a bomb a patch before is now a "me smash" dummy

Can confirm yes/no nor how it compares to previous versions: but yes, it seemed only very basic enemies could join up in "swarms" and those tended to perform basic attacks. I can't tell, though, if those basic enemies were always there, or did Larian swapped some more advanced enemies with those swarmlings.
Perhaps Swarm AI will be developed further to include more possible actions?