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.
Pretty sure the market would be bigger if manufacturers didn’t remove the feature in order to push to wireless.
What I like about them is not having a battery, meaning they have a lot less impact on the climate. And it isn’t needed when they are always connected to an other device with a battery that is less than 1m away.