Villas
The aircraft was in ALTCRZ in which it is linked to Altitude in Alt window and when disturbed from it will try to get back to it by climbing or descending while VS0 is not linked to any altitude but V/S zero.
If you read the article, the aircraft was in OPEN CLIMB.
"The aircraft climbed through FL373 when the first officer noticed the speed had increased to 0.81 mach and had engaged in a 3000 fpm climb, the speed trend indicator suggesting the aircraft would accelerate beyond the maximum mach number operating (MMO) of 0.82 mach."
In open climb, the aircraft attempts to maintain speed by adjusting pitch to change the V/S. 3,000 fpm with only 700 feet to go is excessive. Pushing V/S zero will change the auto thrust to speed control. Once the aircraft is under control again, a gentle climb rate of say 500 fpm using V/S would be sensible.
Why do you not like using V/S 0?