You can accomplish much of the same thing that this type of offense looks to achieve without going at break-neck speed. As long as you limit substitutions, forcing the defense to use the same players, you can take a pause to read the defense and make sure that you have the play and players to attack it properly. There should be multiple variations to allow the QB to change the play if need be and still run without subs. This way, the defense still has little chance to rest, and the offense can still run fast without being reckless.
Ultimately, the point is to score and to wear down the opposing D. That’s more effectively accomplished by constantly keeping the D on its heels and guessing than by simply going ultra-fast, IMHO.