> I don't care about a headphone jack, at all
Does "works for me" work for you as a reason for closing a software ticket?
Built-in speakers and bluetooth are probably the most common audio output cases for me, and I suspect it's that way for most people. It's totally fine and probably a good idea to recognize that and improve the experience on that front.
But complicating corner cases are a definite reality. If you're someone who was treating your iPhone as a digital musical instrument, for example, bluetooth's latency probably makes it a no go for you. But of course, that's too niche, not a market that Apple does or should have to care about, those people should be buying more complicated niche hardware, right? OK, let's use a "normal consumer" example: if you're someone who likes to connect your iPhone to a car stereo, then maaaybe bluetooth will work out for you, or maybe it's going to be an interesting challenge dealing with the auto/stereo manufacturer's implementation. A 1/8" aux input? Just works. And lets you charge your phone at the same time. Or at least it did.
And before someone says "well, get a dongle" -- a dongle isn't "just works." And that's the thing that bothers me so much about this. It's essentially a user-hostile decision for some portion of users, with no particularly compelling upside for the rest of users... but a thin margin of manufacturing savings and a nice accessories/integration play, I suppose. I fully expect that's just business for many enterprises and "just works" is an acceptable casualty, but I didn't expect it from Apple.
But I do now.
> I actually like my phones getting smaller and lighter
Surely there's a point of not only diminishing but actually vanishing returns. Maybe literally. I recognize that's not going to be the same for everyone, but for me "diminishing" started around the form factor of the original iPhone and I stopped seeing any particular utility in shrinking around the 4s.