It has huge use when you realize you just need a very short burst of two or four rounds to destroy a single vehicle. The spalling created by 35 mm APDS is incredibely good.
But the AP-I (aka APHE) also is very dangerous against vehicle, you got ~600 rounds in total, more than enough for a good match of shreding vehicles around.
Some systems varies the round quantity in total, Type 87 SPAAG is around 620 rounds if I’m not wrong, the system with more rounds in the Marksman family.