One person out of the thousands posting to the many forums I follow should not steer your course of maintenance. Follow the recommended maintenance in your owners manual. Ask your mechanic and let him guide you in the maintenance of your car. If the mechanic recommends much beyond what is in the manual, find a new mechanic. Don’t overly depend on the advice from individuals on forums, including myself, use us for things to consider and realize that we are only speaking from our experiences which are limited.
You are likely more concerned about your Scion than is warranted. You bought a great reliable car. Follow the owners manual for maintenance and drive it like you want it to last 10 years and it will last 10 years.