[quote=@Krash]
[Steel Legion]

Actually really curious about that too. To my knowledge, current meta in 40k is classic "shit broke, everything is magic at this point." but with a large infusion of new tech courtesy of the Primaris releases. I would imagine that things probably haven't changed too much with tiny nuggets of higher end tech / archeotech sprinkled in that our suicidal Rogue Trader won't have access to. I can't imagine one of the primarch's being chill with sending rare gear on a suicide run.
[/quote]
We'd have somewhat improved weapons and armour overall. Trade with the Leagues of Votann, Cawl now basically being Fabricator General (and thus free to tinker with whatever he likes), and Vulkan's return would raise our tech level somewhat.

And yes, the Primarchs aren't lending us the really good stuff, but what we have is going to be slightly better than what's in 40k. Our marine may have a bit better power armor, the lasguns that the crew have would be at the level of hellguns/hotshots, and the ship may be armed with derivates of space dwarf weapons.

Also, for ease of discussion, I have made a discord server: https://discord.gg/ypM5Zy4hvu