The lightning only headphone thing was really blown out of proportion IMHO. I personally have not used wired headphones with my devices for the last 6 years. And from my own experiences traveling for work, I rarely see people using wired headphones/in-earphones. The market has been moving towards full wireless for some time now. For iPhones, removing the 3.5mm jack was not a big deal. Now if they did it 3-4 years ago, it would've been. Remember MOST of the electronics consumer market doesn't care about backward compatibility or universal ports like we, tech nerds, do. And They represent the lion's share of the market.
In my own experience traveling for work, it's almost just the opposite. In fact, in my own experience traveling, I keep encountering options where good old 3.5mm would "just work" while Bluetooth or Lightning will not (1 major example: in flight video/audio systems, none yet offering a Bluetooth or Lightning connection). Perhaps you are just sensitive to only noticing support for your own (or Apple's) view of the world and/or I'm sensitive to only noticing support for my own view? What I find though is that since I'm not solely locked into only an Apple product world, this "for the best" argument just breaks down.
Perhaps next time you travel, try counting how many wired headsets you see vs. wireless to test your own perception. I suspect your "rarely" tag will change if you actually do some counting. I certainly can concede seeing some people with wireless buds/headset, but then notice them having to use something else when they need to make a connection(s) and Bluetooth is not available. For example, as good as Bluetooth may seem to some of us, what if you want to watch (and listen) to the inflight movie or TV show? Does your airline have an easy way to make them work? Does your airline have ANY way to make them work? Is carrying along 2 basically same-use items (2 kinds of headphones) great for us consumers? How about having to carry along multiple adapters to try to make 1 choice work well with just about anything we encounter?
Until this decision was somewhat forced upon us, the ability to put on a movie and share the audio with anyone else was just a matter of a 3.5mm splitter. Now it's Lightning to 3.5mm adapter AND a splitter. Is anyone able to share a Bluetooth only audio stream with someone else? Meet the person on the plane and jacking them in to watch a video or listen to some tunes together used to be so easy, and their headphones (even if Windows/Android) could easily jack right in. Now, one of you better have an adapter or two, or if either of you are dependent on Bluetooth, there's probably no audio sharing. That was a nice experience mostly lost now unless one of you happens to be carrying the right combination of adapters.
Furthermore, when traveling for work, I will inevitably find myself needing to connect to something NOT made by Apple. For example, a client might have some device with a 3.5mm jack readily available (because it is far more ubiquitous than Bluetooth or Lightning) but not be as set up for a Bluetooth-only connection... and certainly not Lightning.
Or just working between an iPhone and a Mac requires the adapter unless one tries to make Bluetooth their answer... which then locks them out of all kinds of other audio streams where Bluetooth is not available.
So again, I can appreciate the "Apple is always right"-type rationale except not all of us believes that. This decision is a hassle for me in some way at least once a week but often every day when traveling for work. All the "Apple is right" counterpoint doesn't change that fact for me. Perhaps I am an extreme exception, or just one willing to write down the reality of the impact.
Worse, I don't expect this to fully resolve (on par with 3.5mm ubiquity) for many, many years. The rest of the tech world will go USB3C for a hard-wired connection and only some audio stuff embraces Bluetooth. I wonder if the non-Intel-driven Audio component world will ever embrace USB3C or Lightning over just continuing to include 3.5mm because it's a cheaper & far more ubiquitous component. So we consumers get to enjoy carrying 1+ adapters for years and years to approximate a ubiquty benefit that used to be built
inside iPhone (and that had no adverse effect on those happy with or coveting either Lightning or Bluetooth options when it was there).