With Unity, they don't have to build as many core systems. It handles the lighting mostly automatically, it handles collision detection of various ridiculously shaped assets, etc. The programmers mostly need to tell things when/how/where to move, and add moves. Versus art which has gotten absolutely insane in gaming. For everything that actually moves, there's a dozen that don't. Books, pipes, mushrooms, coins, dust and dirt on the books and pipes and mushrooms and coins, enemies, trees, bushes, flowers, butterflies, pillars, docks, boats, skyboxes, clouds, grass, moss, cellphones for snakes to hold, nouns, etc. Games are packed with so many objects that exist just to be looked at these days.
They can probably use another programmer or two, but I think the AAA standard these days is MASSIVE art teams and smaller amounts of programmers.
Seems they just officially announced Dean Wilson. Interesting that he left Rare after working on Sea of Thieves while it's still in development. This Dean guy has the right idea
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