Indeed, it's hard to get a decent DAC incorporated into a dongle, making your nice wired headphones useless for decent sound. Loss of the jack also makes charging and listening to music simultaneously impossible, or at least a challenge - I suppose someone will come up with a multi-headed dongle to allow both charging and listening through the lightning port. Though my 6S+ still works well, I have purchased both an LG V20 and a V40 after Apple dropped the jack. Both of the LG phones have impressive 4-channel DACs for use via the phone jack, and sound wonderful with nice wired headphones or wired stereo speakers. Guess that's my answer to your FiiO X3!I concur with what you say. My current phone is a Huawei P20 Pro which has no headphone jack. It has a short USB-C adapter cable to allow use of wired headphones phones which I thought would be fine but I do find it extremely inconvenient.
When exercising on gym equipment I watch downloaded TV programmes on my Galaxy tablet part of the time and to then swap to my free membership of Apple Music on my phone meant getting the adapter from my locker. If I had it ready in my pocket to use I know that it would likely get lost, or I could leave it in the gym equipment holder etc and have to go back and collect. Just a hassle not worth bothering about. Also, the sound quality using the adapter is the poorest I have experienced on a phone for years. So I use my FiiO X3 music player for music in gym now. Of course the sound quality is far better so I need to thank Huawei for giving me the extreme inconvenience that got me back into the routine of carrying my FiiO X3![]()