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.
for earbuds it’s useful as many modern phones can share their battery to wirelessly charge another device, so you can top up your earbuds off of your phone while you’re out somewhere and not need to lug around a charger and cable.
For wirelessly charging phones, I agree the pad style chargers defeat a lot of the point, but I am a fan of the dock-style wireless chargers. I have one at my desk and can just glance at my phone to see notifications, and I have to set my phone somewhere anyways, so this lets me top up my phone without really thinking about it.
That’s the only benefit I can think of, the reverse charging on phones (which is very slow). They could add that feature to the usb port though. I mean the dock thing sounds alright I guess, but I just plug my phone in, then it’s charging on desk and in hand and it only needs to be in for like 30 mins and it’s full charged.