re: How many franchises has JJ ruined now?

That’s a pretty big caveat. I mean, one of the main characters in TFA is a slave soldier. Enslaving these less-developed outer-rim worlds is literally how the First Order builds its army. Kinda a big deal, isn’t it? Slavery is also a theme in the whole idiotic casino planet shenanigans in TLJ.

As for the imperial garrison on tatoinne, ANH mentions that was a recent thing. They were only there because they were chasing the droids. This is not an established imperial base. Tatooine is basically Casablanca.