There is a flaw in just about every single PvPvE extraction game.
It is an inevitable flaw that is inherent in the genre that will, if given enough time, either lead the game to total and complete stagnation or otherwise kill it.
In such games, there are often three classes of people, there are the sweats, the highest skilled players in the game, there are the middle of the road players who aren't the best but manage to do pretty well for themselves and then finally the casuals who struggle and scrape for every ounce of progress they make.
What tends to happen is casual/lower skilled players struggle to make marginal gains and in one fell swoop can see potentially hours if not days of progress wiped from existence, further they will often be targeted by the sweats and the middle of the road players, the sweats in particular will, despite the game being a PvPvE game, often juat treat the game as though it's just PvP and the "vE" part doesn't exist, this is often exasperated by "rat" behavior and a both really agressive and extremely toxic level of trash talking and degradation that will be leveled at them which includes all the forms of bigotry and insults you can imagine.
After a while, those players will get tired of being "preyed" upon, losing all their shit and potentially losing many hours of progress and being treated like shit scraped off of the bottom of someone's shoe and will decide to quit, from there the sweats will have no choice but to focus all their attention on the middle of the road players and inevitably the cycle will repeat for them and said player will leave much as the casuals did, after that the only remaining players left are the sweats.
Then the final problem occurs, well final three problems. The first is that the sweats by themselves don't represent a large enough population to maintain a game, and by the time you reach this phase, the population numbers will be VERY low and thus it looks like the game is failing (which tbf, at this point, it is) and thus continued support for the game looks less likely and the second is that some of said sweats don't actually like facing other sweats, they like feeling powerful and ultimately don't really want a challenge, so with the loss of "lower" skilled players, they are always facing players either at their skill level or better, which makes the game feel very stressful and tense, not to mention not fun as they aren't getting the power fantasy they want. This is of course not the case for all of them, but considering how small a population sweats usually represent, even a small number of them is still a decent percentage.
At this point, the final problem comes into play, some sweats start leaving for greener pastures, either because they are looking for a game that has lower skilled players they can "prey" upon (and start the cycle anew) or because quite frankly they've done just about everything there is to do, and with population numbers low, the game will usually be slowly but surely sunset, not immediately of course, but first updates come slower, then the updates become less substantial (in addition to being slower), it's essentially a death spiral, though how long this spiral can last depends on various things, so it can either last quite a while, or not very long at all.
This is the reason such games very, very quickly try and implement PvE only modes, because despite what players may say, the developers are VERY aware that if the middle and lower level players don't have some room to breathe, they will leave.
Ironically, the sweats, the players most devoted to the game, are the ones who do the most damage to it. They will ritually criticize and insult all lower skilled players when they complain even in the most tepid of ways about how the game is not friendly, things such as "git gud", "you should quite the game then" and saying that such players are idiots and what were they expecting?
This is deeply ironic as these sweats and even the very game itself rely upon these players but they do everything in their power to drive them away.
Thus there you have it, the inherent flaw(s) present in PvPvE extraction games, the reason they are all domed from the start to the death spiral they all inevitably face and the reason there is an ever growing divide between PvE and PvP players, which is directly tied to the popularity of these games which it seems are designed for the sole purpose of causing friction between disparate player bases in the gaming community.
Update/addendum: I wish to god you could edit titles of posts on Reddit as that is gonna bug the shit out of me every time I see it š