One app that's showing up in "app compatibility" for me is JBL Audio. This app is the only way to configure equalizer settings on a JBL speaker I have.
I've already tweeted JBL about this; hopefully they update the app. But it's a bit sad that Apple is basically forcing us to not be able to use certain apps anymore if the developers don't update them. The apps still work FINE, there's no reason to break them on purpose!
They're not forcing you to not use it. They're letting you know that the app could cause issues/slowdowns.