Question: What exactly is the appeal of having a PCC. I have a host of warts on a USB charger that is plugged into the wall. I can charge 4 batteries (65) at a time in about 2 hours. That's at very minimum 8 hours of vape time for me, more if I'm busy and doing other things. I have two others ready just in case... I can break the whole device down to iphone size for travel in about two minutes. I guess if I was going hiking and camping, but still...

Would someone please help me understand the draw of these devices? I don't think that I need one, but maybe I do?
Cause they're cool

No, not enough explanation for ya....
I'll give an example that explains it for my situation.
I have a bluetooth headset for my phone that basically has a pcc, a battery is built into the carrying case. I use my BT headset for minimum 2 hours a day between work and a long-distance relationship. The case lives in my truck and the headset ALWAYS goes back in its case when not in use and I know my headset is always charged when I pull it out of the case. I usually need to charge the case once every 7 to 10 days. Without the case I see a few different likely outcomes: I'd be grabbing a dead headset often, accidentally leaving it in the house regularly, or best case I'd just have to charge it every other day...and that just seems like a pain
So I'll use my pcc the same way. It lives in the truck, which might as well be my office. It always has a spare fully charged battery at the ready, if not two, and when a battery dies it goes right in the charger to continue the cycle. Less chance of forgetting batteries in chargers at home or my store, less chance of realizing I have a pile of dead batteries I didn't get to charge the night before, and I should only need to bring the pcc in from the truck every 4 to 5 days for a charge.
And that doesn't even take into account traveling...
This may have been a very long winded explanation but the example is why I decided to purchase my pcc in the first place cause I, like you, have enough available usb ports and wall warts to power a small town

I'm not telling you to go buy one, I'll leave that to others here

,but hope that helps you understand their popularity.