To be fair, people can (and probably should) be farming the zone for stat augment capsules (yes those yummy Stat III capsules) and Veterans (Dread enemies) for that Dread Keeper.
It's unfortunate that the system started bugged, making people settle quickly into the mindset that they have to be instantly ready. But now that it has become more forgiving, and spawn locations are known so search time is mostly eliminated, there's less reason to just sit around and wait.
True, when there are too many people with bad gear or even lower levels, any second lost could mean failure, but then in that kind of groups, there's no reason to believe any second gained would have made the difference, either. After all, there's no HP bar on Gigantixes.
The real problem, I think, is in how special the loot is. That kind of loot makes everybody want to get in on the action, including people who hate camping out random spawns. But this is perhaps a staple of the PSO2 game, where they don't really design what players want, but instead design what they want and try to get players to play it.
Still, there are also people who remember camping spawns fondly. While it is an uncommon design in this day and age of fast food and instant gratification, it is not a "bad" concept inherently. I wouldn't be surprised if there are Gigantix triggers later on when triggers are implemented.
As to the current arrangement, it could be improved, for example, if the Gigantix scaling automatically ignores people who are not level 20. This will help towards eliminating animosity, witch hunting, and general toxicity in the community when unsuspecting newbies wander into the fight.
PSE level-downs and Gigantix scaling off low level players, these are the two design decisions in the current NGS that I would consider absurd, stupid, and even malicious, which don't conform with PSO2's "let's have fun together" concept. I hope both are taken out asap.
For now, I farm the zone when I camp out Gigantix spawns and return to the spawn points when clouds start to gather. So I don't think the random spawn is that bad.