Everyone I've talked to agreed with me on this.
DPS Junction feels much weaker than the other two, and without the healer or tank junction, GNB has no sustain or mitigation. Unless you junction a tank or healer, you can't fulfill your role as a frontline combatant. The DPS increase you get from DPS Junction feels negligable, especially since you die too fast without healer or tank junction.

Furthermore, what sucks the most about this ability is sometimes there will only be a single healer or a single tank on the enemy team. And you have to fight with the targeting system to junction them. This can be incredibly unfun if you're already focusing an enemy DPS, because then you have to target a healer or tank and then come back to targeting the DPS you were focusing. If the enemy team comp is 4-dps (in Crystal Conflict), it feels incredibly clunky and frustrating.

TL;DR: GNB is too squishy with DPS junction (you have 0 mitigation or sustain in your job kit), and targeting a tank or healer feels like I'm actively fighting against the targeting system's clunkiness rather than fighting against the enemy team. Moreover, the DPS junction doesn't feel impactful at all, so I straight up feel like I'm throwing when I junction a DPS.