Long term members want to provide the most reliable advice and the most cost effective advice. None of us want to be the reason for a no-start on a family vacation in some "tucked away" location. Also, we have seen MANY more out-of-the-box failures with aftermarket sensors and actuators. We are in the loop enough that if/when OEM parts start to have more than their share of failures, then our recommendations will change accordingly.
No one has ever called anything a perfect part (and certainly no perfect forum members!). BUT, we KNOW, there are a lot of counterfeit parts being sold, and a lot of cheaply made ones. New ones come on the market frequently, some at cheap prices. They need to be "proven" before being recommended. And for the record, there are a LOT of aftermarket parts that come highly recommended, based on their proven merit. We have seen many weak OEM parts over the years, and called them out for it as well.
No doubt a percentage of the lessor quality aftermarket parts do well enough to stay in business. Forum advice is never perfect either. It is all about "best probability" - seeing how we offer no warranties, we don't have a huge stake in the game .....just reputation.
Anyway, it is an old thread.