Yes, then it just doesn't work.
Lotl have been singing in English since 2007. They don't do it because they perform at the ESC and think that it will be better received. A band that has been singing English for over a decade is so inauthentic if they suddenly sing German because the ESC bubble thinks it's better.
Loreen could also sing in Moroccan. After all, it's her root.
Sorry, it annoys me with the German singing. They do not sing German, because it is not their passion. They do dark rock, gothic, gothic metal.
Ramstein do industrial metal. That's not even 3rd degree music affinity and not a baby.
How would it be to deal with the act itself. Then maybe it wouldn't be funny but just not the own music taste.
And if they now sing German they would no longer be the baby of Ramstein because they would then sound like?