With completely wireless earbuds, the rule is: when the battery fails, they have to be disposed of. Not so with the Fairbuds, that allow you to replace batteries in just a few seconds. Combined with a repairable design, the earbuds should therefore have an extremely long lifetime.
Nice, I did not know such a connector existed - that will be useful for completely different and unrelated use cases.
While I had toyed with the idea of a portable, Japanese - made DAC for a while, I switched to Bluetooth headphones years ago. Started out with a cheap Philips headset for $50, later on got the Bose QC 35 II (still my daily driver when outside) and finally worked my way up to the Sony WH-1000XM5.
I did not realize how nice active noise cancelation is. Plus, the frequency reproduction of the XM5 with LDAC enabled is absolutely fine.
On the cons side, you’re walking around with $300 - $400 on your head, which is an absolutely luxury, plus you’ll get headphones that perform equally well in the sound department (minus the excellent ANC and freedom from cables) for a lot less.
Actually, get one with more pins. The one above is for charging only.