It refers to unpredictable pattern on how tome spawn and this is what makes it the true worst Frontline mode of all time.
It was bearable when Ninja still has true stealth where they can steal enemy node back but that is gone after 3.0
Seize was infamous (and still is) for leechers and afkers because node is recapturable where leechers and afkers can just idle there doing nothing pretend they are "defending" the node.
Until they forced mode rotation, this is why Seize never pops after Shattered is introduced (while Secure is still pops for 24 men mode)
The sole reason SE made improved version in which is Onsal Hakir but nevertheless it still has RNG spawn issue, but because of map setup, it is bearble.
New Shattered on other hand spawn timer is patterned and predictable.
Small one spawn a fixed timer
There will only be 2 large one on the field at same time and new one won't spawn until old one is destroyed (spawn location is also predictable)
What new Shattered is missing is just a re-capturable main outpost like old one to re-vitalize with different gameplay style
A re-capturable main outpost also be an instrument to restraint Premade because they wouldn't have no bodies to fully function.
Old Primal players would know what I am talking about (old Shattered)
Premade can not do much while 1/3 or sometimes 1/2 of their team went chasing a solo player out to no where