The pathfinding issues seem to vary from one island to the other and it's definitly not related to the CPU processing capacity. If this were the case we should be getting mixed replys regarding Walrus AI some people even saying it is ok, but no one is defending it or saying it's ok.
They seem to have problems on mountainous islands. Mostly because I think it doesn't realize it can climb some small slopes.
Is the AI for Walruses the same no matter the armor equipped ? Because I'm not sure but a lightly equipped Walrus should be able to climb more easly because of the higher speed they can achieve so if they had a slightly different AI it would help lighter units to transverse hilly terrain more easily. Of course is a pain to test.
If they AI is the same for land units then they are effectively limiting the capacity of the pathfinding to the capabilities of a very heavy Warlus. Also maybe they could "cheat" a little bit the acceleration of AI controlled units to help them get around terrain.
I'm being clear right? because I speak spanish natively.