Fair point on the adapter, but surely I've tossed my "ancient" 3.5mm headphones because of the clearly superior wireless technology. /smarm
And there's no real angst for me here, and I have no dog in this very particular fight because I am not an iPhone user. My main lament is that once Apple ditches it, it's likely that other manufacturers will follow suit, and headphones will go from a fairly straightforward purchase to a nightmare of fractured adapters and/or wireless interfaces. I haven't purchased a new set of earbuds for myself in probably 10 years (thanks in part to the 3.5mm jack), but a family member wanted a set of bluetooth earbuds last Christmas and it was a bit of a challenge. Whereas the typical problem with 3.5mm earbuds is fit, the bluetooth/wireless ones had issues with fit, balance, battery life, sound quality, staying connected, and delay.
I get that it's the future, and in 5-10 years no one will remember the day they took our jack away, but I really just don't look forward to the transition phase. And I really wish we were doing a simple swap from wired + analog to wireless + digital without losing the ease of use, quality, and single standard format.