It's always been like that on the iPods and especially for what I use it for when I'm in my car it's so stupid having the charger in the bottom and the headphone jack at the top. Now both leads come out the bottom and it looks so much neater. It shouldn't affect you at all, I know it makes my car look better.
It's easier to take out and put into your pants pocket. You don't have to change the grip or turn the phone.
Phones are usually put in the pocket upside down, now the jack would be at the top in ur pocket even though it's on the bottom.
It's a big negative for me. Using on my desktop would now be a pain in the ass and now I'd have to dump the phone up side down in my car's cup holder . . .
Also could be to help speaker/dock designers. It would give them an analog out (missing in Lightning) and a stability mount.
Yea major annoyance. I like to put the phone standing vertical on the fitness machines at the gym while doing cardio. Now that's going to e impossible.