I already do interact with players. However i very obviously mean in the context of powerplay in the game.I'll highlight your original post and respond in a bit more depth.
More player interaction - interact with more players, then
A Means to Interfere - utilize the mechanics available in opposition, then
More tactically viable options as a means of offense and defense - subjective, but again the same mechanics are available to you
more fun with people you play with/against - sorry but FD can't provide you with "fun" that's something you'll have to determine for yourself as it's purely subjective
As I said, all of those things already exist.
With people doing powerplay in solo and pg you cannot counter fortifying players. You can only undermine a system to 100% to basically make everything the forter did and everything you did null. You can't counter prepping in thqt same situation you can only out space truck them.
So if powerplay is rightly open only, now the options for gameplay and player driven narrative and content explodes. Blockades, either installing them or trying to breal through them. Wings of ships made of haulers and pvpers are now needed in the hot spots. Your enemy is now an actual blip on yoir radar rather than some invisible force you have to look at charts to even know they exist. Rather than battling via spreadsheet it becomes actually battling like powers who are enemies would do.
Solo and pg have no place in powerplay. This is elite dangerous and flying a powerplay flag should be dangerous. If you want elite:hauling and friendship simulator then powerplay isnt for you.