Players in Open can be stopped from doing what they're doing, their actions actively disrupted, you can see who they are. Again, THIS is the part you fail to understand or just conveniently forget about.Players in Open (and the oft forgotten Private Groups) also affect the experience of players in Solo - by design.
I mean, there's obviously a difference between what Powerplay is and what some players want it to be. If this wasn't true this post wouldn't exist. This proposal, like every other post in this section of the forum, is a suggestion to change things. Saying "but it's always been like this" is a poor argument IMO. If you think everything should be left as it is now and Powerplay should be left to die that's okay. There's a lot of people who think differently, though.There's a clear difference between what Powerplay is and what some players want it to be - and what those players want it to be involves PvP-gating it, effectively removing it from a not insignificant subset of the player-base and actually removing it from console players without premium platform access, even though every player bought access to it as part of the base game.