Because Cyber Kano has no real pressure. He has strong footsie tools and zoning that can excel in certain MU's only. Why would I want 1+3 placing people directly in front of me where he is weakest? For example-
If I'm fighting Outlaw Erron, Covert Ops Sonya, etc, other high tiered ridiculous pressure characters, 1+3 leaves me at +13 and with mental adv to make the next move. Anyone exp'd in the MU knows up close to simply block low against Cyber and wait for the poke into pressure opportunity or the armor for combo opportunity. At the current range, I can throw a knife and hit their movement, B1 a Jip attempt, Backdash and punish attacks, step back for more zoning, etc. I have control of those characters at an ideal range. If it left them "close to me" then what happens? I do some stupid B31 on block or a B13 and then have to deal with them pressuring me into 50/50's and plus frame setups into guessing for my life bar??? Nah, I end in 1+3 at times in MU's that it is very beneficial like an Erron MU.
So basically, making it end close up would make it an utter disaster and useless in some MU's because all you'll get is a few % of chip before some offensive powerhouse gets their "turn" of attack up close. Where as now it leaves some characters at a perfect distance for Cyber's strong vital footsie tools in some MU's.