Yeah, get rid of the requirement to do minimum-effort powerplay participation in order to access those modules and you get rid of a bunch of hangers-on who don't actually want to take part but feel forced to.
I'm reminded of a vid I saw recently about the fallout 76 leaderboards which were a fun pvp activity where a key feature was a marker showing you where the top ranked players were so you could hunt them down, but then the devs opened up pve stuff to it, a bunch of non-pvp players got involved and got to the top of the leaderboards, then got mad and started screaming for the marker to be removed because they wanted the rewards of the competitive adversarial gamemode but didn't want the risks.
Well, that kinda shows that you can either let pve players in or not. If you're gonna let them in at all, you need to accommodate their preferences. If you don't want to accommodate their preferences, it's better to not let them in at all.
If they want to make powerplay a purely pvp thing, then that's perfectly legit. In fact, you could make things a whole lot more interesting that way. Make it more of a capture the flag sort of thing, where attacking players only need to carry a few units of cargo and can otherwise kit out in full combat ships, and everything is concentrated into a handful of systems so people can find each other.
The problem is when you have a mode that's largely reliant on pve players to do the bulk work, but you also want to have pvp mixed in there; where you have two relatively contradictory things in the same space. You're always going to have someone complaining.