The biggest problem in this game is balance. Weapon balance. Specialist balance. Vehicle balance.
Weapon balance: Weapons with bloom is a no-no. Maybe bloom is fine after the first 50% of your mag of LMG is unloaded, but before then is ridiculous. PP-29 and DMRs are the only viable weapons long-term. Some of the weapons are also just ??? For instance, try the new LMG out if you unlock you. I FUCKING DARE YOU. It's the worst weapon I've played with. I'm not sure what they want you to do with it.
Specialist balance: You're medic or you're Sunset. That's it. The other specialists absolutely have good perks, but they LACK shit that those two have. Sunsets agility is unparalled and makes Grapple Gary look like garbage outside of Manifest. Her grenade set WITH regening grenades is HUGE for disabling tech/vehicles or bunker busting camp squads. Medics get free exp all day just rezzing. The heal gun is mostly meh, but can be useful if you're actually playing as a squad.
Vehicle balance:
-Ground:So vehicles are interesting because you level them up, as you have in past BF's, but some of the shit they unlock is crucial. Thermal smokescreens, REPAIRS, and weapons that actually do damage. So if you have TimmyXboxUser69 spawn in the Tank first, you're driving a deathbox that's going to get fucked immediately. If NeckBeardXevronX is driving his maxxed out M1 he's going to shoot everyone from across the map to death, probably shoot down some helicopters, all the while repairing anything that hits him beyond the Drone/C5 trick. The light ground vehicles are nice and fast and can get pretty good guns, but their drivers/gunners are exposed so any dummy firing an M5 rocket or spraying their PP29 at your windshield can wreck you. Maybe that's okay, I don't know, but I'd like at least a windshield/windows to mitigate bullet damage. Nothing beats having some one revolver headshot you in a Boat through the side window going full blast.
-Aerial: Same as the other vehicles. You unlock God-mode stuff. The biggest is the Repair function. Get hit with an AA? Well you're fucked. Oh you have a repair button? Nah you can take one more! Just kill them first! The weapon systems range from "this sounds like it's cool" Mini gun types to "Oh this kills everything, everywhere" stuff like guided rocket barrages and 30mm cannons. This is the important part: YOUR TEAM DOESN'T HAVE ANTI-AIR ROCKETS BECAUSE THEY HAVE M5'S BECAUSE THEY GET SCARED OF TANKS MORE THAN HELICOPTERS. THIS MEANS YOU'RE DESTINED TO BE BULLIED BY AIR SUPERIORITY NONSTOP. Seriously, I run AA on every class because I know if a try-hard gets an Apache or Little Bird they can just destroy every armor, every infantry, every other vehicle you have. The problem is it's either you shoot tanks or you shoot planes. Not much inbetween besides Sunsets anti-armor grenade or the C5 recon drone trick. I spend every waking breath as infantry just making sure I use every rocket I have on air support because sometimes left untouched guys will literally go 100-0 in their choppers. The best you're getting with a tank is like 30-0 sniping long range, I've done 25-0 but I had to play pussy because I knew the second I went into the zerg it was M5s to the face faster than I can react.
They COULD fix a lot of the FEEL of the game by just removing/toning down bloom. Rebalancing recoil/damage on some of the non-start weapons. Making Tanks "part disabled" actually DISABLE SOMETHING like tracks/turret rotation, etc. AFAIK it does nothing but tell you you've done X% damage to the vehicle. If they let you spec AA to also Dummy fire at tanks, that would help greatly. I'm not sure how they balance it besides maybe making it corkscrew so it's RNG, but it's still better than having it only useful against 4 vehicles at any point in the match. Honestly they just need to crank down vehicle spawns and numbers. Too many too often. The best part of BF games is infantry vs infantry, picking off people and moving up. Having a big daddy tank just drive through and cannon everyone holding the front feels less fun. Even moreso when it's an Apache or Hind just obliterating 5-15 people instantly that literally have no way to fire back because their gear doesn't hurt vehicles and their bullets don't either.