Who says a high intensity conflict will always be within range of land-based fixed-wing ASW? Nobody. Which means that Chinese frigates and destroyers would benefit from having more than 1 helicopter.
Look at the likely scenarios.
In a low intensity conflict, it doesn't matter if a ship has 1 helicopter or 2 helicopters. It's just a low-threat environment.
In a high intensity conflict, China's core interests are in the Western Pacific next to airbases on the Chinese mainland. This calculation is not going to change until the Chinese Navy grows much larger and can credibly contest the far seas, which will be at least another 10 years.
In the next 10 years, we will likely see 20-30 Type-55 destroyers go into service. And these ships are designed for long-distance operations and have space for 2 helicopters.
The existing frigates and destroyers (with just 1 helicopter) can still be employed in the Western Pacific with MPA aircraft which are more cost effective than helicopters in most scenarios in the Western Pacific.
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