Don't remember if this was already touched on, but it is interesting how it's stated it's uncommon for imps to own/start their own businesses, when, we practically see that all the time in the show, and no one really says anything?
I could excuse the show if it had established a clearer distinction between the lower class imps and... everyone else, besides the goetia being that wealthy 1%. It just seems like the imps are more akin to regular everyday civilians than products from the slums. It isn't helped how the native species of hell are indistinguishable from the sinners either. Imps seem straightforward, but are there people who become hellhounds when they die? Which in this universe are just anthropomorphic dogs with red eyes. What about anthropomorphic birds? What's stopping this undefined system?
Even the 7 deadly sins, in my honest to God opinion, don't feel like old entities. I had this theory in my head a while back that they were just another set of sinners who became overlords because Lucifer liked them or something. They don't feel particularly unique.
I believe Vivziepop could rectify this if she kept the majority of the sinners human, just for ease of distinction, and those who have committed the most heinous of crimes turn into unique creatures, basically indistinguishable from the other inhabitants of hell. This could also stir up more conflict because when the angels come down, they're only there to purge. They don't care who's who, unless it's Charlie, or Lucifer. (They should also cut out the fact that native species are spared because... why would Lucifer even care??) There could be an uprising, lead especially by the V's because they want to keep their greedy triple enterprise on the rise.