EA on why FIFA 18 isn’t using Frostbite on Switch, will be better than last-gen version

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Zekkyou said:

My guess is that the Switch version is actually running on FB3, but an adapted version of an old build and they decided they didn't want to associate it with the current version.

Yeah if I had to bet, I'd say that's the most likely option. I doubt they'd go to the trouble of making a whole new engine from the ground up just for one version of the game, especially a version where sales performance is uncertain.