Both Miele Customer Service And Our Tech
Told us years ago that slower spinning washers last longer and that there wasn't much to be gained after 1100 or 1200 rpms.
At the time our Miele stopped spinning at 1100 and was trying to find out why/wanted it fixed, hence the response.
Suppose spinning at 1800rpms isn't that bad if the load is perfectly distributed and the cycle is smooth as silk, but often that isn't the case.