I'm curious about how (or if?) the A6's failures, presumably due to moisture build-up, has been addressed in the A7.
In my experience it has. According to LZ they've made changes to the filters (that's what causes this issue) and so far I haven't had any issues despite using the A7 both at the gym and for walking outside in rainy weather. I can't do none of these with the A6 without the volume starts to decrease. So far so good for me but of course we need experience from more people to be sure.