Irbis wrote:How would they fluff justify separate army lists when they're already integrated?
Simple. Codex: Ultima Founding. Give all 12 chapter traits in the book, all primaris units, plus some
SM units that would make sense in primaris chapter, add a table with unique wargear options for infantry leaders under the relics of each chapter, boom, you're done. Easily fits under standard Codex size.
There are also suppose to be chapters that are completely Primaris founded after the Indominus Crusade from that main crusade force.
I think primaris armies should have their own distinct traits and stratagems. Primaris introduce tactical differences that are more pronounced than some chapter-to-chapter differences that get distinct rules.
As far as standard
SM units in a Primaris army... basic marines are something of a precursor for Primaris, and while Cawl was able to grow them relatively fast in his laboratory, post crusade they're supposedly being produced by less exotic means... meaning Primaris would need a pool of basic marines the same way normal Chapters need scouts; that is just to say that it wouldn't make sense for "completely" Primaris chapters to be made only of primaris marines.
In this way I think we get to where a big difference between standard chapters and primaris chapters would operate; there wouldn't be any of the elite or more veteran standard marine units. There are also loads of vehicles and units with wargear that are relics of the dark age... maintained and irreplaceable, but Primaris don't have that legacy. Most if not all the
IC's would likely be primaris. With that in mind you start cutting out many of the standard marine units from the codex.