There has been software with singular visions of their designer - Juan Antonio Arguelles Rius (Arguru) with the original Deckadance, Rick Cimorelli with Rockit Pro (both deceased in car accidents!), but it's usually a team effort with long term development, using some input from the software developers own forums.
Yeah...I really miss having Rick on these boards. And his RockIt software has a great customizable auto mix feature. It was my software of choice - simple, stable and effective.