I always thought that stereo was an invention of Alan Blumlein, who created recordings with crossed microphone pairs to simulate our anatomical auditory apparatus. Playback was intended to be by 2 speakers with an equilateral angular relationship to the listener. This was when recording was strictly 2 channel in a live venue...still the model for any good HiFi system, IMO.
This doesn't directly suggest a particular speaker dispersion pattern is best...Ohm/Walsh, MBL, German Physiks, all go for a cylindrical wave pattern (Ohm modifies theirs to reduce treble splatter). Quad ESLs whether intentionally or not were highly directional. Floyd Toole's influence has made "uniform power response" the de facto orthodoxy. Most of us have issues fitting the ideal into our homes' limitations anyway, so solutions are many, some effective.