Get rid of the charging port and you can make the phone completely water and dustproof.  The vast majority of phone repairs are due to moisture damage.  It wouldn't be covered under warranty usually if they could tell it was water damaged, but sometimes you can't tell it's been wet until it's opened up.  They could probably virtually eliminate iPhone repairs except for physical damage due to drops and things by doing this.  Probably would be a noticeable increase in their bottom line if repairs are any kind of significant expense,  They could create a phone that's almost indestructible.