You want the phone to be thinner (essentially less battery) so you can purchase more battery separately, strap it onto the phone and make it thicker.............?
Not to point out the obvious but wouldn't it be preferable for you to want the phone to be the same/thicker so you can get that extra battery preinstalled in the phone? Save yourself the cost of an expensive battery case and potentially get more battery life...
Apple will go thinner and with the less or the same battery life. They are so stuck on thinking thin is in.
Like point and click cameras, "we have the smallest camera blah blah blah" but you can't hold the damn thing because it's so small.
Bragging rights seem to be apples priority.
I wouldn't mind having a thicker phone in lieu of a bigger battery.
While in Vegas the other couples husband had a Samsung 6 and watch. Battery life on both were much better than my 6s+ and Apple Watch. Not by a little either.