Not sure the problem is just wear. The SD card seems unusually likely to be destroyed by power cycles or brownouts. I don't feel on especially solid ground say

Not sure the problem is just wear. The SD card seems unusually likely to be destroyed by power cycles or brownouts. I don't feel on especially solid ground saying that - although I've experienced dead (micro) SD cards myself. It's a controversial topic, and no doubt some people are confused by what's just filesystem corruption. There are flamewars.