curious about 9k+g combo

why people use 9k+g 2p 46p+kp(53dmg) instead of 9k+g p 46p+kp (55dmg)?
This hits from aoi to Akira (Akira open stance only)
but when this can be used on 80% of the chars. in both stance(no trick and no timing difficulty), why do people still use 2p to connect it instead?
Is this because this doesn't work on version D? Then what about R?

 

Cos not everyone is good at hit checking. 9k+g is neutral on guard so its pretty safe to do 2p. At most both parties land 2p on MC to each other.

 

so for fast hit checker its safe to do p for the extra 2 pts of damage?

 

If its a combo its a combo /forums/images/%%GRAEMLIN_URL%%/smile.gif

 

Might also be lingering VF4 era habits.