I wouldn't hold such a large-conclusion to just PvP/IB in this instance. While PvP is just an excessively chaotic mess that proves "if everyone is overpowered, then no one is" to be an unenjoyable gameplay state, it simply cannot be the reason to quit the whole game. Your argument is ultimately blaming matchmaking on PvP's faults when so many more variables come into play and using it as to why people are quitting the game and or being toxic. The toxicity I would blame on Trials, allowing players to block each other off from rewards is a surefire way to get them to hate each other. Get someone trashing on you like they're on something and the idea of wanting to yeet their system out of their window doesn't sound too bad. Have people regularly deny others success and they begin to appear as villains gatekeeping the loot to themselves for either protection of their glory that goes to their heads or flexing in a videogame where people have grown to stop caring about what you've done because there's a great chance it isn't special. Let this fester for several years, bring the toxic mode to PC and it's no surprise people wanted to cheat at it. Can you even remember the 9 months of PvP prior to Trials of Osiris' inception? I reckon the whole vibe surrounding the Crucible was muuuuuch better. Only crap back then was getting torn in half by Vex Mythoclast, Blink + Felwinter's Lie + bad counterplay movement available on an old console at low FoV ( cause I bet this would hardly be as bad now), and people getting butthurt over Suros Regime's Focused TTK (although I'm pretty sure it does that kind of damage again and no one cares). Iron Banner was actually liked and not a complete meme. PvP in general had no reason for excessive sweat to be running down the sides of your face, and it should have stayed that way. Its very essence has grown to be too competitive for causal play to be a thing anymore and I believe Trials is the root of it all. I mean think about it, this is a good year before Overwatch came out and competitive FPS kinda blew up [again]. So, you have this constant escalation of gaming, in general, entering a very e-sports centered era, Bungie botching D2 to appeal to that, everyone wanting to come back from it, and ultimately reaching the other extrema of that scale because people just wanted more and more. Eventually, Trials would return and unsurprisingly fall flat because the experience is even more dogshit than when it left. You can start to realize that it doesn't matter what Bungie does for PvP, it will suck, and that's because Destiny PvP in general sucks, because fighting other people in this game sucks. It doesn't even matter if you're good, it's simply not enjoyable unless you're completely smashing people and it's practically by design. Take a mode people will be very desperate to win in and hand them absolutely crazy tools and you create a brew for toxic chaos when people get angry (at each other) that stuff is unreachable. More so when skill feels like a non-factor because everyone is basically OP. You can't nerf people's mindsets but you can nerf their tools, however, this doesn't actually stop the beast that you created. And that's more to why PvP can't be saved and why people would stop playing it, it sucks.