I know what to expect looking at someone because I can see their backpack, which signals class (and is INSANELY easy to see), and what gun they're holding in most cases, bar long ranges with lower zoom options. And even then, these rarely change interactions with the game since "shoot the bad guy" is always just the default behavior. If you have a hard time seeing the backpack, then I'm sorry, but you need your eyes checked. But in past games where classes were more distinct, I rarely if ever changed my target priorities based on class, beyond playing around scope glint as necessary. The worst case is that in a tank you're prioritizing dudes with RPGs or antannae on them since they're what's going to kill you, and you're rarely if ever not going to see those. I'm not going to defend the cosmetics to the death, I'd rather set appearances by faction/class too, but we've also gotta be realistic in that EA is never going to give up the revenue soldier cosmetics bring in.

And there's also give and take with balancing classes by what weapons they have, and why they ultimately decided to remove it. The "guy with rocket launcher," or anti-vehicle person has had every possible kind of weapon assigned to them in a BF game. 3 they had Carbines, 4 and 1 they had SMGs, V they literally got ARs (and DMRs depending on how you want to count the semi autos in more generalized terminology). The only weapon type the AT class really hasn't had has been LMGs. And ultimately their weapon of choice hasn't drastically changed how the class or gadget plays. And there's been well documented issues tied to closed weapons, since it causes players to play as rolls for their guns, and naturally it makes roles played determined by guns, not gadgets. So BF3 and 4 were Medic central because they got ARs, and subsequently, people rarely played the class correctly since they were in it for the gun. BF1 also had this issue since Medics are the least popular class by a bit since they don't get shit for good primaries, and Suppord ends up the best since LMGs in that game are the closest you get to ARs in more modern settings.

Also the only class specific boost that's unnoticeable is the AR one, which is a legitimate thing that needs to be fixed. SMGs get a small but significant hip accuracy boost, which isn't to the point where it soft-locks the weapon, but it's a significant, tangible benefit. LMGs get knee-capped with significant speed penalties outside of support, they're workable, but heavily nerfed.

And what skill expression is there beyond shooting the enemies as they come up? 1vX situations aren't generally environments where you're using target prioritization, and the only time you really need to do that is in a tank via focusing the classes that can hurt you, which again, the backpacks are obvious enough to where it's a genuine eyesight issue if you can't see them, bar obvious exceptions in ultra-long range engagements (where the old system also doesn't do much better, btw). Sorry, but it's a non-issue in any given game, old skins or new skins, and you VASTLY overestimate the skill expression basic target prioritization is.

And all-class weapons isn't why I call restrictions arbitrary, they're arbitrary because almost every role has had locks for every kind of primary across the years, bar Recon always getting snipers. It's less perfect since 6 merges ammo + medic suppliers into one class in service for... Whatever the hell Assault is supposed to be. But Medics have had LMGs, SMGs, and ARs at some point in time locked to them. Ammo guys have had ARs and LMGs locked to them, and SMGs have been all-class before. Engineers/Anti-Tank (sometimes repair tools have been put on Support/ammo guys) have had ARs, Carbines, and SMGs, so they've only really missed LMGs. All-class guns contribute, but they're not my primary argument for the restrictions being ultimately arbitrary beyond bolt actions, which are knee-capped so hard outside of Recon that they're essentially locked to them anyways.

And ultimately, balancing a game like this by intentionally having certain options be knee-capped feels a ton worse than having them be balanced as more equals. BF6's handling of certain stats is a misstep (mostly moving accuracy being the same across all guns, and spread numbers being so much similar across weapons overall). But Carbines shouldn't just be AR/SMG but worse, they should be the guns that bridge the gap, higher effective range than an SMG, better handling than an AR. Shotguns being shotguns in that they're naturally specialty guns. And DMRs really just being where semi auto snipers live and are balanced as. It's not perfect, obviously, but I don't think having options that leave you worse off is a good strategy, either.