If you take some time to look at SLSA aircraft on trade a plane or controller, you will quickly realize that the vast majority of these planes are being bought, and sold every day with illegal modifications on them. My comment isn’t to the legality of the situation. It only shows that people just don’t care. I also haven’t seen any federal actions of enforcement either.
So the only group that is reacting to it is forums online.
I have also seen many experimental light sport aircraft that aren’t following the rules as well. Many are using constant speed propellers. I haven’t herd of any actions on those either.
I have a SLSA aircraft with 3 letters of authorization from the manufacturer. Not all builders of SLSA are equal. 🤷