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.
ANC makes the baby crying more pronounced & that’s more annoying than the rumble of a bus. +1 to passive noise cancelation on silicone tips. A bit more in general gets thru, but the it isn’t amplifying voices & other loud sounds. Brains are pretty good at turning out the rabble of a cafeteria or transportation.