I think the average person just orders a dodgy battery of eBay. If the phone catches on fire they're on the hook for it. Plus phones have a two year designed

I think the average person just orders a dodgy battery of eBay. If the phone catches on fire they're on the hook for it. Plus phones have a two year designed for lifespan. So it isn't a priority in that sense. And users like phones looking sleek etc. A phone reviewer is going to note that a phone is bulky if it has a replaceable battery.