DH and I have had new iPhones every 2 years since 2009 and new iPads every 2 years since 2010 and luckily never had a problem with any of our cords. It probably helps that I always bought a couple extra cords from Apple that we leave in place (desk, night stands, etc) so that's got to help. But even the ones I use while traveling have held up with no problems.
I'm not sure if we just got lucky or it's the fact that we only use Apple cords purchased directly from Apple? But I'm knocking on wood, as I'm sure I've jinxed myself now. 😄
Be kind, for everyone you meet is fighting a hard battle.
~ Ian Maclaren