The point of removing the headphone jack is to sell Bluetooth headphones, thinness and waterproofing were what we in the trade call "lies". It'll never come back unless it's mandated.
It has been done more recently to, inclucing water resistance.
E.g. Samsung had their flagship Samsung Galaxy S5 series phone with removable battery in 2014.
The issue here is that people think this is novel due to the way things that have been done recently. It's not. If a 10 or 5 year phone could do it... your newly released iPhone would probably as well. However, unfortunately, it's in Apple's main interest to keep their clientele 'zealot' through brand image (people see iphones as a status thing, at least here in Brazil) and planned obsolescence, so they don't really have to improve the phone or act beneficial towards the consumer.
It also had an IR blaster so you could use to control TV's and other tech.
Headphone jack
Swappable battery
Expandable memory
IR blaster
It was basically the perfect phone
I remember having an s5 "active" model that had even more water / dust / rugged protection. With the headphone port and removable back cover to change everything. Was a great phone at the time.