There are some quick combos, which I can’t do manually.
One example is the Cole’s Slide -> Followup.
On quickcombo, the followup always combo.
On hand, I couldn’t combo the followup. No matter how hard I tried, with a lot of different timings and ranges.
Another one is guile Stand Punch, Crouch Punch, Flash Kick, and a Balrog one that combos two Dash Uppers.
On hand, I can’t get enough time to charge the moves. But I haven’t tried hard enough too.
And I found a very useful Vega quick combo.
It starts with Scarlet terror, so it’s a 1-meter instant chargeless Scarlet Terrror.