I probably should have picked a component Lexus actually tells us to inspect rather than my hypothetical comparison.I've never seen that recommendation in any FSM or other manuals on the 1UR-FE... that would be a costly inspection as it is the same procedure to repair a timing chain cover leak.
EDIT: Looking around see talk about it on these motors but not the *UR..
Lexus 2GR-FE, 2GR-FSE, 3GR-FSE, 4GR-FSE
Regular oil changes are about the best thing you can do for the timing chain and related components.