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.
I wouldn’t trade my wireless stuff for wired ones at this point. Wireless earbuds have gotten so good that dealing with a wire would be a downgrade in most cases. When I work with mixing I always use my monitors with a wire, for obvious reasons.
Also as an aside; any company that claims to do anything “green” is profiteering off of greenwashing. Of course making stuff environmentally friendly would become trendy in the cringe corpo world. I think the most egregious example is Apple’s autumn 2023 iPhone event. Just thinking back on it is making me cringe.
The “greenest” product is the one that is never made to begin with.