A hamfisted effort to give the Eldar a reason for trade and imperialism I think. Make the craftworlds less self sufficient to remove the glaring question of why they even bother interacting with anything else. Could have been done better, the Eldar already have one resource they can't make on the Craftworlds; soulstones. Possibly the most important thing to them as a society. But then I suppose that still leaves them with no rational reason to ever deal with the Imperium on a friendly or hostile basis.
Was about to say, GW must've forgotten about Eldar and their obsession with soulstones, crone worlds, and the existence of maiden worlds & exodite worlds. We already have plenty of lore examples of eldar forming mixed species societies with humans and other aliens, and it's usually the imperium who shows up to kill everyone. So it's not like the eldar don't have plenty of reasons to interact with other species beyond compulsion. Eldar corsairs as well occasionally sell their services / negotiate ransoms so there must be eldar who have a fondness for things that money buy that wraithbone can't make. And someone is selling imperial cold traders eldar weaponry. Exodites as well are very well-traveled, and dark eldar are... Open for negotiations. So there's plenty of reasons why eldar would trade for stuff, and even then, there's an abundance of examples where eldar have still been interested in the wider galaxy just because they are interested. There's even a craftworld that negotiated a treaty, giving them an exclusive imperial battlefleet for protection every time they pass through imperial space
GW is slowly working towards having the loose 'Order' alliance become more official in 40k I think. Probably planning to take another proper crack at allied detachment mechanics or mercenaries, like they have in AoS and Old World. Classic route they've tried before is Imperium, Eldar, Tau and Necrons on one team, Chaos, Dark Eldar and Orkz on the other, Tyranids by themselves, with there being some overlap in the more nebulous groups like the Dark Eldar and Eldar allying well, but the Dark Eldar not allying well with Imperium the way the Eldar do.
I miss the old allies matrix. It was fucking hilarious because nearly all imperials were happy to ally with imperials. Certain xenos like tau, eldar and the imperium could be wary allies. Orks and chaos could kill the same enemy in the same room together, but afterwards it'd get interesting. Necrons and tyranids could only ally with themselves. And every faction in the game treated allied contingents from their own faction as battle brothers - except dark eldar, who trusted no one, including other dark eldar from their own faction.
With the stready drip of primarchs getting 40k models they're probably building up to some big story of Chaos vs Order. I don't really feel such a thing is necessary. 40k worked with a more or less frozen timeline for decades at a time, but then I'm not in an office crunching sales numbers for GW.
Ngl my enthusiasm for 40k has been slapped to death like a seal in the club club. When I talk to players who came in from 8th edition onwards it feels like there is a gigantic gulf between us over what 40k is. They do stuff like play 40k to win, build competitive lists, the whole game feels like an attritional card game where you design optimised metas on a spreadsheet. There's no importance to vehicles, army comps or positioning. Everyone's just placing fat centre-piece heroes with stacking modifiers, rerolls, no thought to the lore of their army. Even the lore itself feels like a marvel comic where it's no longer a grim dark future where no one matters, but a very small setting where 5 people matter and get all the attention forever, forest gumping into every single relevant occurrence. It is the groggiest thing ever to argue over 40k but damn. It genuinely just doesn't feel like 40k anymore xD
I guess it's part of the natural evolution of an old IP when they shift target demographics. But I also think it is possible to change things without abandoning core principles or components of the genre that made the IP big in the first place. I felt like after they restructured their design process, so that the art teams, writing teams, games rules teams and modeling teams worked in separate buildings, you could feel 40k being hollowed out in the absence of creative leads like Alan Bligh. Codexes stop being cheap little books full of artwork, custom rules, short stories, modeling guides and gaming tactics - and become overpriced shit with an online app DLC live service model. Sculptors no longer get credits, creatives are kept separate from one another, GW makes a deliberate policy of keeping even their content creators anonymous and their writers on short leashes to avoid making more celebrities like Abnett or McNeil. Games designers being treated like disposable unskilled workers getting £24k salaries and vague marching orders from above.
It's a bit like the equivalent of going to a nice little family restaurant where you know everyone, they know you. The food is great and there's a sense of community. Then it gets bought when the owner dies, the new manager turns it into a michelin 2* restaurant, but the prices are sky high and the place is deliberately exclusionary, with the chefs and waiters becoming anonymous employees. Yeah I know I'm not the target demographic of michelin 2* restaurants, same way I'm not the target of competitive card games, bolter porn & luxury collectible monopose miniatures. But I was there Gandalf, I was there when it was still a family restaurant
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