I wasn't responding to you. I was responding to the previous comment that Andromeda is useful in teams without heals. While true, that's already a sub-optimal scenario. If your debuffs miss and the boss is winding up a 15k damage attack, you're in serious trouble. Mordred makes that much less likely to happen. There's a few compositions that avoid this issue (Dark teams with Balor, Fire or Light teams with the rare elemental resistance down skill, teams that will always have elemental advantage), but they're the exceptions rather than the rule.
In other words: plan to have a healer kamihime. That's one reason a lot of people start with Sol. She's not necessarily an optimal long-term pick, but she fills an essential role in early to mid-game, regardless of what your primary element ends up being, and she also brings utility skills that are situationally useful even in late-game.