How do you plan to hold these razor thin phones then? During last years I went from 9.3mm (iPhone 4S) in small formfactor to 8.9mm in 5.0" phone to recent 7.4mm in 5.5" phone. The last one even after almost a year of usage is insanely hard to hold and use naked. It is slippery (metal) and always tend to almost fall when I reach far corners or put it in the pocket. I bought spigen case entirely to have a better grip on this thing, not for the protection I don't really need. With thicker rubber case it is less of ergonomic nightmare and I don't fear that it will slip out. Why on Earth would you want a thinner phone? (I'm not even talking about subpar iPhone batteries)

I've never had this problem or realized it was even an issue. I tend to use my fingers on the back of the phone to hold it. I'd like it to be thinner because it's in my pocket all day.

Just out of curiosity, what's the payoff of having a slimmer, yet ultimately bigger phone?

I guess there's a cohort of iPhone users that never use the jack but in the early days at least it was a compelling feature for many. (remember all those proprietary connectors we had back in 200x?)

The idea here is maximizing both screen space and portability. Obviously contradictory goals but the headphone jack compromises one without helping the other.