Your insistence that folks buy trash phones that get thrown away (and are totally unsupported software side almost from date of mfg) is ridiculous and actively harms the environment.
By increasing confidence in their products, including used products, apple does a LOT to enhance the perceived long term value of their product. There is a very active apple refurb market, and you can take your phone and get new batteries etc from apple.
They have a huge retail presence with walk in repairs. They have authorized third party repairs. And they have mail in repairs.