There are three potential uses:
1) Finally reaching 100% crit with the help of a crit ring, a well-timed release, and an extra 5 SP in one of your classes (which you'll get from leveling). That allows an Atra Bow to benefit from the S2 and S3 that increase critical damage by 3% and 4%, respectively. That way, you could have a bow with +11% damage from S-class abilities alone during Rapid Fire and gear release.
Note that the official site has a text saying "It is effective when you want to keep the gear effect, such as after annihilating Enemy!" (if google translate isn't messing it up) for this ability, which implies the released gear isn't consumed while using a bow. Once released, it's 100% crit until you die, switch to a non-braver weapon, switch to a katana and let it deplete for 12s...
2) Extra passive PP regen when switching to an Orbit katana, thanks to Katana Gear Boost. If you released gear previously, you can switch to your Orbit katana anytime you have nothing to shoot at, and benefit from the +50% PP regen of Katana Gear Boost applying multiplicatively over Orbit's +200% PP regen (5 PP/s -> 15 PP/s -> 22.5 PP/s for normal -> Orbit -> Orbit+gear).
3) If the PP increase rate of Katana Gear Boost also works with a bow, then bow-dedicated users get a massive PP boost. Katana Gear Boost increases PP recovery both passive regen and PP from normal attacks. With gear released, a fully charged normal bow shot during Rapid Fire would increase from 75.6 PP (assuming all three arrows connect) to 102.6 PP. On top of a passive +50% PP regen (5 PP/s -> 7.5 PP/s).
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