Fascinating how plants develop different attributes. I don't know enough about succulents to tell, but it would almost seem like some of that delicate fuzz were designed to capture dewdrops and possibly fog drip in arid areas... and maybe they take on moisture via the leaves, not just the roots.
=^..^=
These grow high in the mountains in Europe and these hairs are more likely to act as insulation. Tiger jaws mesembs use their "teeth" to direct dew and condensation in the way that you are thinking of