Casting a 1/1 and attacking the next turn as a 3/2 flying is back-breaking, especially on the blind flip, while you ride the flier to victory using counterspells and bounce spells
I ran the question past my pal Jason, and he suggested Bennie might've been overshadowed by go-wide commanders with more colors, such as Jinnie Fay, Jetmir's SecondJinnie Fay, Jetmir's Second and Jetmir, Nexus of RevelsJetmir, Nexus of Revels
The floor, however, isnt super high, since a 2/1 for two isnt exactly great
After 30 years of development, sacrifice cards have matured well beyond Sacrifice and Lord of the Pit to encompass all colors, at least a little, and blacks have become stronger than ever