Game engine != Productivity(artist/designer) focused game engine. I've worked on UE3 based titles, in-house engines and quite a few in-between. Building a new

Game engine != Productivity(artist/designer) focused game engine. I've worked on UE3 based titles, in-house engines and quite a few in-between. Building a new engine from the ground up is easily in the 10s of millions if not more which is why you rarely see new entries into the market. Sure FB could do it, but it probably makes more sense to worth with UE4/Unity to augment them. You'll be able to draw from a large base of developers/designers/artists who already understand the workflow instead of having to build up that community from scratch. [edit] Also the default-large packages of UE titles is mostly a function of optimization, We'd have only ~200mb of system memory back on the PS3 which is way smaller then what modern mobile platforms have available to them. UE has a bunch of things you can do to pull them down, it just takes work.