I don't actually care all that much about Solomon's Ring, though the explanation about how ability damage modifiers affect skills with damage multipliers was useful. As usual, the game mechanics are needlessly unintuitive, and it's left to players to figure out how they actually work. But my takeaway from this isn't that ability up modifiers are good--it's that other modifiers scale terribly. In the end, a good modifier becoming less good over time doesn't make a bad modifier good. It's still bad; it's just that the alternatives are now worse. But I've also been saying for a while now that temporary character attack buffs are overrated.
But I'm more interested in where this assumption comes from that assist skills buff the whole group. Where's the evidence / what's the source for this?