Should Bio 1 be a cross class skill in place of Ruin 1?
For WHM and BLM, cross class skills are already rather limited, at 7 each.
WHM has no use for Physick, with Cure 1 being identical as a spell, and being better because of Freecure.
BLM has no use for Hawk's Eye, as it only affects DEX and Physical accuracy.
Then comes Ruin.
Ruin is useless for BLM once it obtains Scathe, as it has an identical recast, deals more damage, is instant, has no travel time, and even occasionally deals double damage due to a trait.
For WHM, let's compare Ruin and Stone. They have the same travel time, cast time and recast time. Let's ignore the heavy part of Stone, assuming the mob is already weighted or is immune. 80 unaspected damage vs 140 earth damage. For a mob to take more damage from Ruin, it has to be reducing earth damage by a little over 43%.
(continued in next post, I hope it's okay to multi-post)