maybeplayable against 1400s , but honestly theres gonna be some really prepared players in all ruy lopez continuations, so why play a somewhat questionable(my opinion is that the riga is just terrible) opening then a completely playable, and perhaps better ruy lopez varation? again i dont recommend ruy lopez for black inless you know theory like your back hand.
Since some comments seem to be missing but this was a top google result, I would add that it's because having two bishops vs. 1 is about half-a-pawn better than one bishop vs. 0, and there's no reason to cede half a pawn.
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