Well thing really is that attack helo chain gun isn't really there to so much punch holes in heavy amour, it works by obliterating the vehicle and essentially ripping it up with rapier like shots
In that sense 30mm and 23mm isn't that different, obviously 30mm is a heavier calibre and so better but at the end of the day chain gun against light infantry will make them duck no matter if it's 23 or 30mm
For punch holes you use ATGM or armour piercing rockets, only down side of WZ-10 is obvious lack of attention paid to reduce engine exhaust no engine flaps no engine covers or exhaust modifications just open exhaust on both sides very vulnerable to its biggest threat, IR missiles
Think that has more to do with the lack of power with the engines. a lot of constraints and areas are constraint when your engines lack power. so only the crucial things are kept in place, while the other areas are added on when more sufficient power is provided.
I can a variation to the Z-10 when higher power ouput engines are available.