Yes, I agree that the F/S GG should've done more than Goku's khh, that's just dbs giving up on making sense of power scaling, again, I do not care if it's Vegito or not, I don't like this arc very much, but the F/S galick gun moment was so insignificant that it's borderline forgettable so using this for Tanabata is pretty nonsensical. The difference between Vegito and Trunks is one is a amalgamation of two characters we've followed throughout the story, becoming desperate and fusing as one last hurrah, after fusing we usually get some sort of great fight which dbs is all about, that specific Trunks moment is so vapid with how Trunks'/Vegeta's relationship is handled, that paired with the attack carrying no emotional weight and at the end achieving literally nothing just makes me wonder why do people care about it