I don't really get the hate for the lack of a headphone jack tbh. Have people complaining about this ever really given good bluetooth headphones a chance? My Beats Solo 3 have fantastic battery life, i can switch between devices with a click of a button (in the case of the Bose QC35 even be connected to two devices at the same time, listening to music on the laptop while being able to receive phone calls on the phone…
It's strictly a decrease in functionality. My phone, with a headphone jack, also supports bluetooth, if I wanted to use it. What do I gain by losing the headphone jack?
There is no consumer device used by virtually everyone where every square millimeter counts more than in a cell phone. It's not like there's just an empty hole where the jack would be otherwise.
That space is being used for whatever component(s) Apple thinks its customers, as a whole, find more valuable -- i.e. a net increase in functionality for the average consumer, even if not for you personally.