Yeah I lost motion effect for my wallpapers as soon as I updated to the Android 10. I really hope that they add it back in with the next update because I really like that feature and have been liking it since the Galaxy s6 edge
Android 10 has removed stock live wallpapers. Recently in an app for wallpapers I was able to try some and successfully apply them so you can still get them but yes they have been removed. I'm not really surprised that the Samsung Reps who reply to these threads aren't just saying this. Actually from what I've seen of their replies, no I'm not really.
I've seen on several other forums posted about other devices as well that they have been pulled.