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.
My most expensive earbuds were $75.
At $150, I’d rather buy multiple “lesser” ear buds and not worry about battery lifespan.
I have 2 pairs of hang-on-ear type I use for the gym/exercise, that were $35 each. That’s less than 1/4 the price of these.
Then these aren’t for you and that’s fine. You don’t value what they offer, and you’re not obligated to buy them. Some of us do.