Frame traps are the more consistent way to setup counterhits. They also stop people from mashing. Basically if you are plus frames on a move (blocked or on hit) then you have a frame advantage. If they try to do something like mash jab or tech, then you can usually blow it up with another move, and you’ll get a counterhit. Counterhits are powerful because there are some combos that are only possible off of a counter hit. They also do more damage and stun.
Lets say I’m Guile and I have Ryu cornered. I dash in and do a low short, I’m now at plus, so I need to do a move that is probably 4 frames on startup. If he tries to do a cr.mk, and I do a cr.mp, then counterhit him because my cr.mp will actually come out before his cr.mk. His animation will start but be interrupted, because he’s doing this move when he has negative frames. If he loves to jab or cr.short after he is hit, then I can do a close st.fp. It has about 4 frames startup and hits crouchers. This will blow up his attempt at mashing, and he will get hit out of it.
Frames traps are the best way to beat people who mash jab a lot, especially at a disadvange