1: Your last line "a simple grind gains an extra dimension" makes sense to you but the fact is that many, many players don't want what you'd consider to be an extra dimension. These players consider dealing with gankers to be the real grind in the game.
But that's the point. When the Powerplay people were on Lave Radio, it was a resounding yes to open only. Sandro posted that it is intended for consensual PVP, which only works in open only. The idea is when you sign up for PP you should expect PVP if you see an unfriendly player.
4: Solo/Group play isn't the problem, the problem is the expectation that some players have to set up comprehensive blockades or to win battles simply by ganking undergeared ships. Even without Solo/Group play a simple block list/instancing issues would keep any of that happening with any real impact anyways. In short, the game steps on your ideal in multiple layers - it really is built into the core of the game.
I'd recommend that your faction up its political game.
Court PvE haulers instead of viewing everyone without a pimped out Corvette as a total waste of time.
Maybe the policy of "kill everything that ain't us" was never intended to be rewarded by the game?
No, you use a ship that can outrun a corvette and take the punishment for the few seconds while you are in the big ship's range. You cannot use a simple min max trading vessel in that kind of environment, or you bring a wing of your faction to distract the corvette while you run for it. It's similar kind of environment for when the Hutton truckers did their mug runs and were attacked by the code. In this kind of gameplay, you are not a trader delivering leaflets, you are a blockade runner, more Han Solo and less Postman Pat.
The main issue is that someone always has to be be the bottom run, the prey that everyone is after. You have to make that gameplay interesting otherwise without that bottom level, the game mode collapses