Waldo
you seem to miss the point
Manch atc does not have a problem wih the sids, its certain pilots
that seem to.
When your departure separations are based on aicraft flying the sid you expect you dont expect it to be comprimised by aircraft going the wrong way
The check is there to safeguard a known safety issue.
By the way if you brief a departure then check it again before take off how does somedody turn left instead of right 1 min after departure