As small of a feature of having the headphone jack at the bottom may seem. It actually makes quite a difference.
I use my headphones a lot. And I forgot how convenient it was having the jack at the bottom, until I switched to the note 4.
The wires is now drooping down over the phone, which is more annoying then you think if u use headphones a lot. And I usually put my phone in my pocket top down naturally which now I can't when using headphones.
For people who don't listen to music or talk on the phones with headphones much, I can see why the feature is meaningless. But for me it was a huge difference.