When you look at the 3rd person view in Zwift, all cycles properly sway from side to side when cornering (roll). When you are in the 1st person, that is not used for camera positioning. And it should be, as it would make the rides even more immersive.
Just to clarify: I know that some people may find it problematic and probably feel nausea or something similar, but I guess that there should really be option for doing so, if someone wants it. I recently came accross this piece of art: https://youtu.be/05pkPXLRAGg
Apart from rendering (Zwift is far from being realistic and I don’t mid that) other aspects could be easily be done (I guess) - this one - camera rotation - being the least expensive from the programmer point of view.