Read the Bragg interview, the part about adventure. These are not sport climbs prepared for the convenience of the masses. It IS a good climb.
Lichen won't hurt you. Did you know that the entire Trapps was covered with lichen when Hans and Fritz first visited? That's why the first route they did was at Millbrook (Old Route). The Trapps were unclimbable, so they thought. Eventually the cliffs cleaned up, part due to the passage of climbers, and part, I think, due to environmental changes (acid rain?).