In the real music, beat is perceived by the human and 4/4 120 BPM on computer is same feeling as 8/8 60 BPM. But in computer music BPM is set for a certain convenience. For example in this DAW, the BPM is determined by the quarter note. http://www.steinberg.net/forums/viewtopic.php?t=56065in that video, the guy says that it is
https://www.youtube.com/watch?v=qtvx57P4oKo
This OP is annoyed by the feeling of BPM changed when denominator changed. He wanted to set the standard of beat to the eighth note.