Beyond: line collection/line stack

[south bolt]

Is it me or does the meaning of "line collection" imply that you have 1 of each illuvial in the line and not that you have every variant within them? I would like to propose a clarification to this. that a line means 1 of each illuvial and an "Illuvial Stack Collection" mean you have all illuvitars of that illuvial. Or call it "Doka Line Collection" and "Doka Line Stack". I use stack here and there may be better considerations but I feel there are 2 levels to this collection you have the collectors and the stackers.

[orchid shale]

I get your point, but I personally don't think calling them different things would add too much value:
The Tier 0 collections "Illuvial Stack collections" (All expression, only stage 1)
The regular ones Tier 1,3,4 and 5 "Illuvial line stack collections" (all expressions for all stages)
The Lynxes "Illuvial Line collection" (no expressions)

There are milestones within the collection for having all expressions of a particular illuvial. So while not explicitly stated, there are rewards for holding "stacks" of an illuvial.
I don't think it will matter too much how we call a collection, but it's an interesting observation.