I agree that C&P could use a loooot of work, for sure, and I'm hugely in favour of solving the 'ganking problem' via actual game mechanics and diegetic rules.
However, I do wonder if your point about "being part of the community" is based on, possibly, some wishful thinking. Seems like you're imagining P2P is more forgiving and broader than it is, that instances aren't incredibly restrictive... and that we're constantly meeting people in space in open, or that when you do meet people there's tons of potential for nuanced interaction. This really isn't the case most of the time - player sightings are fleeting and mostly silent. That's partly why I'm not thrilled by the prospect of the community activities I care about being diluted by people who don't understand/want them - it's already rare enough to get a populated instance at all.
In places where players actually congregate like CGs it's easy to either a) use system chat to find people to play with and hop in an instance with them or b) hop in open and block gankers you don't like. I feel like you think there's a big ole' party happening without you that doesn't involve shooting... and there sort of isn't?
Trying to look at this issue from another angle; let's imagine a flag system was added - the first thing I would do would be to block all the invulnerable players I saw in the hopes that eventually I would be back in a position where instancing was favourable to my preferences. Given there aren't actually very many truly antisocial "d-bag gankers" it seems easier for you guys to block them than for Open fans to block all of you, but again we don't have the statistics on it.
EDIT: Also by the way I appreciate your contributions to the thread, thanks.
So aside from trolling me, you're now gaslighting. You're making condescending comments to this guy that his experience in the game, isn't really real and he "feels" or experiences things wrong.
But I guess now you finally gave us the truth. You just don't want to be stuck in an instance with people you can't shoot at. I mean after pages and pages and all kinds of dishonest debate tactics, you could have just boiled it down to that. Of course you wouldn't have come off nearly as well if you just said it that way, so instead you obfuscate.
The plainly obvious answer to this would be for FDEV to dedicate all resources to removing the instance limit. Which, duh, are being spent on solo and PG groups currently. I mean we just got an announcement the company is worth over a billion dollars. I think they can afford a few more server blades, don't you?? If that's your biggest concern with this....then just whatever. So silly.
Then you bring up the block feature. Well, PVP players hate the block feature anyway they tell me. There would be no need for the block feature to work as it currently does, if we could flag ourselves and stop griefing. Did you consider that?