Jets are fine, maybe even too weak. Little bird is completely broken, and the only helo in need of a nerf. Transport needs to be more durable, and attack just needs buffs all around as it sucks horribly. Completely worthless helo in BF6.
Engi lock ons sucking is a major issue. But you can't really make them better because one of the design decisions was to give every engi 5 launchers on spawn. Without trimming back the amount of launchers engis get, you can't really buff them to be actually useful because then one engi can just decimate the entire lobby.
Bad design all around. This is why the real battlefield games made the design decisions they did. CoD dev team tried their best, but they just didn't get it and instead of copying what already existed, which is what a lot of people really wanted, they made the whole thing worse.
The only thing is it's still better than CoD, and all other options are too milsim.