actually I agree it doesn't have to be so accurate, but parents need to know where these seats come from. The reason why I wanna raise it is because some people would mis-interpret these data and mis-understand the situation. For example, conclude the missing seats as 太多「世襲生」.
For your information, if there are seats given up through discretionary places stage, there is a waiting list in case you are not aware of to fill them up.
At the end, the intention is to understand the system better for better decision.
The root cause is increased no. of children population. This no. increased, of course, the chances of admission drop even that the no. of P1 places unchanged or even reduced.