I'm sure Moses, when he was crossed the desert to the promsied land, found sandals entirely comfortable and practical - otherwise he would have filled his biblical Nikes with sand. However, in a cold climate, it can only be said that sandals are crap.
Holidays: the are acceptable.
Day-to-day use: Completely pointless.
Wearing tube socks with them is like the male equivalent of a fat bird wearing tight leggings. Bleugh.