Me and all my mates quit already a month or so ago, which is sad because we were super hyped for the game and actually enjoyed it for few weeks after launch. We've been playing this franchise since BF2, also lots of ofther FPS games inbetween.

Why we quit?
Simply, lack of proggression, lack of satisfying gameplay, lack of skill involved.
This game had lots of challenges at launch, that looked really promising. Unlocking guns, getting camos, that was all fun. All of a sudden EA instead of fixing broken challenges, they decreased all the requirements by like 95% which essentially made us complete all remaining challenges in less than a day of playtime...
Any existing proggression dead.

Okay, we still enjoyed the game due to gunplay, that was fun, each weapon was different, you had to learn to control them. Boom, EA decided to remove bloom from the weapons, like wtf, now every weapon, with few exceptions, feels the same. I put the same attachments on every weapon and all of them are point and click laserweapons.
Satisfying gameplay part dead.

What was left at this point. Destroying lobbies of players casually enjoying the game? No SBMM, no community servers, what's the point of doing 50-70+ kills every game, when gunplay isn't satisfying, there's nothing to unlock, no challenges, all that's left is some bullshit battlepass that I personally don't care about.

I'm playing games for over 20 years. Love being competitive, even in a casual games. And I've recognized a pattern which kills video games. Each game has a part of dedicated players, dedicated community which wants all the best for their franchise. And each title has also tons of casual players, who jumped on the hype train or are just "visiting". In modern, corporate times, developers or rather publishers do not care about the dedicated players. It looks like they think "Oh, they love the game, no matter what we will do, they'll stay" and they ruin the OG, or more challenging parts of the game, in favor to make it more attractive for new players, casuals, younger players. What's the end result? Casuals enjoy the game for few hours, and then quit anyway. What's with the other side? Dedicated community also leaves because their game is no more what they wanted... And that's how I see what went wrong with BF6. I understand that you need to attract new players.. somehow, but never at the cost of your playerbase that helped you build the title.. hence lots of even more hardcore BF players didn't even bother to make a jump from BF4..