I don't consider ADAD movement to be a problem as long as it's slow enough and there's enough momentum/animation delay for you to read when a person is changing direction. It's only spam if you're unable to reasonably counter it.
The implementation in Battlefield 6 is pretty tame. My aim isn't anything out of the ordinary and I'm able to deal with it just fine. Sure, it can make me miss a few shots or lose the firefight, but that's fine. It's just a tracking aim skill check that mostly occurs in CQB. You counter it by working on your aim.
If you're using DMRs, you're likely too close if people use ADAD movement on you. If they use it when you're at a proper distance, the spread penalties would not allow them to accurately fire back anyways.
If you're using LMGs, the same applies. You need to keep some distance. Once you do, people can ADAD, but they'd just be catching bullets. Movement isn't going to save you against a mounted LMG. People sometimes forget that you can mount on pretty much everything in this game. Walls, ledges, vehicles or just the ground.