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Collimatrix

Yakovlev MFI submission

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I'm not sure why, but I suspect that survivability was a major concern.  Sukhoi's S-37 delta wasn't popular with the brass for the same reason:

 

sukhoi_S-37_delta_2.jpg

 

That NK-32/NK-321 is a hell of an engine, BTW.  I'm assuming they would have reduced the bypass ratio for a fighter version, but the bomber version delivers an outstanding 55,000 lbs of thrust in afterburner.  That Yakovlev MFI would have had about as much thrust as a rafale or EF-2000, just on one engine.

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