Why the fear of installing third party parts? We've spent many decades tinkering with desktop PC's, for example, and if somehow an errant part blew the whole thing up I wouldn't expect to be able to go back to the original manufacturer and whinge at them.Too much liability. What happens if third party parts wrecks the phone? If Apple says they won’t repair phones with third party parts, there will be law suits.
What about cars? If you change your Ford oil filter with a generic one do people panic? They have the option of genuine parts or cheaper off brand parts. If the things are a liability people won't buy from that manufacturer. Cars also have the safety factor to consider- you don't want to risk the lives of your family or other road users. However if I chose to upgrade to a set of Brembo brakes I wouldn't be terrified I'd gone behind Ford's back, nor worry that if the Brembo brakes failed that Ford would be opened up to lawsuits...