The codex needs a full-on overhaul I think. There is over a 100 items that can be used without restrictions, but their codex entries are only visible when you have researched ways to purchase/manufacture them, and sometimes you can't do that at all with your faction. If an item is usable from the start, its stats should be visible from the start, even if you can't buy or make it yet.
I'm playing sisters, and get an event each month where veterans arrive, complete with their own weapons and armors. I can use those, but can't see any stats for them until I research manufacturing projects for them. So I'm assigning armor to units without knowing what it does.
My first terror and ork bases were deathskull larpers, complete with ghetto terminator suits and commissar cosplays. They dropped like 30 different guns and ammos I can use, but can't see any stats for again. This time, I will NEVER be able to see the stats, because codex articles are locked behind IG-exclusive research.
I've also researched dominion-pattern bolters, which I can use and manufacture. And I can't even see codex articles for those, because they require high-tech requisition level, even though bolters themselves don't.
If you go the bugged chaos route, you also get chaos armors, for which you can't ever see codex articles either.
It's getting really tiresome to assign armor and weapons to soldiers without having the slightest cue about how much protection they offer or how much damage they do. And I'm not talking about 1 or 2 missing entires, more than half my store items have no visible codex entires.