The shul I was at for YK didn’t sing “ki anu amecha” correctly. Instead of doing the normal tune, they said it responsively (I always wondered how Artscroll got that wrong). And each chazzan had a different sort of chant for it, so nobody had any idea what to do.
It was the least inspiring version of the most inspiring teffila I’ve ever seen. Weirdest part was they knew the tune, because the did the correct lead in for “selach lanu, mechal lanu, kaper lanu.”
Also, in my yeshiva, the assarah harugei malchus took like 20 minutes and was the most inspiring part of mussaf. But at my new shul they basically just babble it.