For what I can see, Lexus Relax is a warranty that Lexus gives, for FREE, to cars that are no more under warranty, at the condition to have a regular (one service at a year) official maintainance , and I appreciate very much this, as it is a"gift" from Lexus, while others, in best cases, make something similar under payment.
Being a warranty covering fabrication defects, it is obviously limited to components that are not expected to break during normal use and are not subject to have expected faults in 10 years. In this perspective, there is no reason to complain. Just to talk about my problem with moon roof I reported here, if it had occurred before Lexus relax with standard warranty expired, I would had to pay the whole repair...