Well, I never pretended it to be a Total War game
(in fact, I might even hate some of those changes in my normal, historical Total War game). I was talking about a new IP which drew inspiration from TW, but didn't just copy it.
Well, exactly. Same as above
I love Total War, but the formula has got really, really stagnant and uninspired in the few past years, so I think that CA could actually benefit from making a new IP inspired on previous work. I think Warhammer would have been the perfect excuse to try that, and that's why no matter how good the game is, if it ends up just being a modified version of Attila, I will not be able to help it but think of it as a missed opportunity.
The thing about including Anno's physical trading routes and irregular resource placement is not really because I want a trading simulator a la Patrician, but because something as simple as adding those routes immediatly makes military action A LOT more meaningful and interesting, it gives you a motivation to attack a neighbour other than
"my sole purpose in this life is to paint your provinces in my faction's colour". For instance, you might desperately need iron to build armor, or horses for cavalry or even some exotic spice to keep your higher classes happy and you might have not been able to create a settlement in a zone which had access to those resources, so you would be forced to trade for them with other players. If those players refused to trade or you felt like the deal was by no means worth it to you, you might end up in a position in which you would be forced to attack someone whom you didn't really want to attack, be it as a "pirate" to raid their trade routes and steal the "loot" in from the ships you attack, or directly invading and conquering a region which has those resources.
That creates really, really interesting combat scenarios: for instance, you raid a trade route, you destroy or capture the enemy's trade ships with their precious cargo (which might range from resources to some kind of legendary weapon or even an important character), but that cargo is not instantly and magically added to your resource pool... no, they are physical items inside the cargo bay of your ships (aka, an inventory), so you still have to bring those items to one of your cities to store them, and the enemy might try to counter attack before that happens and get back what is rightfully theirs, so you would have to escort the ships/cargo in what could become a really tense "mission" (and that's not an artificial, prefixed "quest" the game gives you, it's narrative drawn directly from the organic sandbox gameplay). Even if you managed to bring back the items safely to your warehouses, they would still not be safe, because they would still be physical items stored there (you transfer them from the "ships' inventory" to the "warehouse's inventory") and, depending on how important they are, the enemy might mount a large scale offensive to get them back, so you would be in turn forced to defend strategical cities that you might have just ignored in TW (there is little consequence to losing a city there). So if you have the only mine of iron in the entire map, you might need to pour a lot of resources into defending it, same if you have managed to capture an important character or item.
For a Warhammer game it would be a little bit more complicated, since for instance I don't imagine the orcs "raiding merchant ships to get spices to maintain their nobles happy" or even establishing trade routes themselves at all, but it could be adapted in some other way (for instance, while a human player might raid a horse shipment to have access to cavalry, an orc player might just use the horses as food). But in any case, I've re-read your post and I agree, I got a bit carried over and mixed what I'd want for TW in general and what I'd want for Warhammer, and I although I think trading would add tons of fun in the game I'm envisioning, even if it was based on Warhammer, I have to agree that for Total War:Warhammer specifically, trading would not really be in my priority list.