This tier is practically bad about not utilizing the mobility aspect of Range DPS but Stormblood had several examples where free mobility was, indeed, an advantage. Godka, M/F and Final all come to mind as non-melee freely fights. Likewise, it's easy to say people do uptime strats. Go ask around how many statics, let alone PF, did uptime Hello, World. You'll find out very quickly few did because it was far tighter. People would be even less inclined if there was only one melee since why adjust a strat around a single player.

Now that isn't to say the Range DPS shouldn't be buff. They absolutely should, though I'd actually prefer they bring back utility in lieu of pigeon holing yet another role into the same "selfish, not as selfish, 'support'" dynamic they've been doing. But there should always be a decent enough gap between the Range and Melee. Just not 1,000.