Can you compare moba to mmo pvp?

No.

Yes.

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Well it's also a fairly PvX genre where map design is a key pillar for encounter balance, something I think Ashes is going to need to study and refine quite a lot, especially when it comes to siege design so I'd add that to the list as well.

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I think you misunderstand kind of. Sieges will be effected by the terrain of the node being sieged as well as the layout of the node's structures. So in order to understand the effects of these things they can use the principles found in other PvX games map design to help inform them.

Caravan's are a weaker example but are also going to essentially be 'payloads that need to be pushed from point a to point b' and the design of the routes between those two points are going to have a large impact on PvP over the course of the games lifespan. Other games with PvX especially a moving payload style PvX are certainly games I think IS could find useful to discuss amongst themselves.