I’m on my third iPhone and I hate what they’ve done. I will stick with my 6s as long as I can and then I may consider other options. I just don’t care about sound quality much. I use earbuds all day long, but I rarely use them for music. I’m usually listening to an audiobook, sermon, lecture, or streaming talk radio. I don’t need enhanced sound quality for audiobooks or AM stations. The only time I use my iPhone for music is in the car and then I’m connected via Bluetooth. I also use the same pair of earbuds for my phone, iPad, and a small pocket radio that I use for AM. I buy cheap earbuds because I often lose them or break them. I’ve got them stashed all over the place—car, briefcase, workshop, nightstand, etc—so I’ve always got them handy when I want them. I don’t want to buy adapters and I don’t want anything else to keep up with.
You don't need to buy adaptors. It comes with the iPhone 7, Free.