Not wanting to kickstart the helmet debate, each to their own IMO.
Pr*t plates and noisy exhausts, could have an issue with them. Quite often not legal and usually not notified to insurers, if the drivers have them. Last thing you want is an altercation with someone who’s invalidated their insurance.
Just saying that tinted windows behind the driver on their own are legal and aren’t necessarily a liability – windows were the only mod mentioned by the op.
Better to be safe than sorry applies to all other road users. Years ago when I did my m’bike training, the 1[sup]st[/sup] advice the instructor gave me was assume everyone else drives like a d**k. (Pr*t plates or not.)