I've had a bit if fun with the maldraxxus stitch factory but you can guess it was meant to be way more than what we got. I'm pretty sure that the original design was for you to choose body parts and body types and attach souls to them, making the conversations with souls more than just a lore funky bit.
Honestly the only thing that has disappointed me is the mission table because the very first iteration (WoD) was definitely the best one with its mechanics though the reward balance for shadowlands is very good and probably the best even.