Re: Wouldn't it be nice ..
I suggested that consumers have enjoyed choice in the size of phone screen size, and you disagree before talking about batteries and headphone jack. I don't follow you.
There have always been smaller Android phones available in the low and mid range. Where smaller Android phones were conspicuous by their absence was in the top range - those phones boasting the fastest processors - until the Xperia Compact range. I've seen a few in the wild.
I've also seen people who've deliberately chosen bigger models.
So I'll state it again: most people having used smartphones over the last decade are aware of the pros (more screen for content) and cons (harder to hold etc) of a large screen and have made their own informed choice.