First, your post is nothing like provocative
Midi Synch does not mean to keep each note or event in an exact mechanical devision of a bar like 1/8 or 1/16. I often play out sequences live, record them with a linear sequencer, and want to play it back later, to have my hands free for other instruments. There is much non-mechanically groove in those sequences. If now the timing is not tight enough, the groove is destroyed and the feeling of the piece of music as well.
And if we perform pure Techno-style music, exact timing is important too.