SF6 Pushback Differences Between Block, Parry/Perfect Parry, Why You Should Never Block Fireballs
Reuploaded for better font/easier to see, added context.
There is a misconception that parrying reduces pushback. The only actual instances of this occuring is when parrying fireballs, and parrying a drive impact. (Blocking drive impact causes a huge stagger, there is no stagger when parrying.) What's actually occuring is the distance is the same, the pushback between the characters is split by half. That's why you can do the same frametraps, light chains in the same sequence between the two states and not cause misses.
I just wanted to clear this and put it out there, also to help people understand the game better.