You've clearly never lost a dispute on eBay. It's possibly the worst customer experience I've had.
I needed a glass part for a projector, it showed up broken. Tried to send it back and the seller offered like a 10% refund. eBay...after waiting a week (mandatory dispute resolution time) showed up, spent another week trying to meditate, the just said fuck it, the seller is right, eat a dick and your broken color wheel.
eBay gives you the illusion of consumer protection until you actually need it.
But no, based on some of the car parts and things I've gotten off eBay...the quality is objectively not better than what I've seen off Temu.
My favorite thing I've got off eBay so far was a catalytic converter. It was empty.
My state doesn't do emissions, and I kind of knew what I was getting...but wow...I can't believe a company would allow that in the first place.