I purchased an iPhone 6 Plus refurbished from Apple and used it for 6 years. Worked flawlessly every day. Looked brand new when I got it. Perfect. Still has its original battery running strong too (I babied it).
I finally purchased a new iPhone a little while ago. Guess which one?…… A refurbished iPhone 8 Plus. It looked brand new too. Not a single blemish. Has been working flawlessly too.
The only “used” part in a Apple refurbished phone is the motherboard