It might be a myth for some but it is certainly not a myth full stop!
I've tried loads of pairs over the last 3 years and on the long runs (15 miles plus) only one pair I have is trouble free. I've tried Decathlon cheapo, Aldi, generic "running" socks, 2 skin socks, 1000 mile socks, specific marathon socks - spent a fortune, yet I still end up wishing I'd put compeed on beforehand.
I tried Drymax maximum protection and I never have an issue in any weather, wet or dry. I just wish I more than one pair (expensive!) as when they're in the wash for a long run (bad planning!) I end up with a rub/blister/issue somewhere.
I can wear any sock up to about half marathon distance then it seems to matter. I imagine it is personal which work for you, and some people have feet that can wear anything - others, like me, don't.