Never played retail, only ever done classic and decided to try this remix because i wanna try demon hunter and holy shit the whiplash is unreal, it feels like i went from driving a car to being placed into the cockpit of a jet

Now a few things im wondering is, is it possible for my characters i level up to be transferred over to retail itself or they gone when remix ends

If i make a new character do they inherit artifact weapon gains?

Is the leveling in retail just as fast as it is in remix?