Hey! Thread zombie, I know, but I just went through the removal of a stock partition in my 2016 Cargo.
I don't know about an "ugly gap," but there is definitely a big hole. One right where the old partition was! Ba-dum-tss.
Originally, I didn't want a partition, solely for the seat travel. My dealer couldn't find a 2016 (for the incentives) with the packages I had to have, without a partition. The dealer quoted me $751 to remove the partition and base, so I said I'd try to live with it. Well, after taking delivery, we looked in the back and noticed that there's just a bunch of bolts and torx holding the actual partition in. So I decided, what the heck! Less than 10 minutes later, the partition was out, and I had full seat travel. Much more comfortable! The only thing left is the lower "base" to the partition, which I don't mind having in at all. I've had the van in to the service center recently, and they didn't see any safety issue with having the partition out, in terms of airbag deployment or efficacy.
Now, there is a little trim gap near the headliner, and I can see what looks like a curtain airbag rolled up in there, but I'm very happy with the ease of removal and newfound comfort.