Well, based on these two statements, I feel that even good service from a dealer would not convince you to like them.
The fact that this thread is mostly glowing praise should tell you something about Lexus dealers in general. Is the service always perfect? No. However, compared to some of the experiences that myself and my friends have had with other manufacturers' dealers, they are miles ahead.
Also, the official service checklist is available on the Lexus website. It states:
"Inspect air filter - replace as required (model dependant)"
This is quite reasonable since replacing a clean filter serves no purpose.