Main reasons I think people don't use string very much:
- Most of the "essential" XP/merit songs use Wind instruments exclusively. Lullaby is the main exception with Mary's Horn -and- Nursemaid's Harp.
Above anything else, you match instruments to songs. Most don't give you the option to pick between String or Wind options, the instrument(s) for that song are simply one or the other.
- For buffs, the variable range on String can be more of a headache than a benefit. Wind is consistent, which is beneficial when not doing the same songs on the entire party.
To a point, sure, it takes a good build for either to make them work well.
Until you hit endgame, really the only thing to look at is the Lullaby situation. The better answer there is: use both. Wind has more accuracy to it, but String wins for range. Using a Nursemaid's Harp on Horde Lullaby gives it a wider radius...so it's preferable if you can pull it off. What you don't want to do is sell off your Mary's Horn when you can get the Harp, which is where most of the anti-String sentiment comes from. Keep both, use Mary's on Foe Lullaby, and in Horde only if you have accuracy problems.
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