It could be part of the reason why SoW is taking so long. It's gonna take much longer to program than a 'game' and in that time there are new developments in the industry which then get included and so on.
'Normal' game developers would just release the game after 18 months, then continue to develop the idea and do a sequel (sales dependant). SoW has to be a lot more future proof than your average shooter. So it's probably being constantly updated engine wise, as new tools become available. It must be hard to know when to stop.
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