Just like @asif iqbal has said many times we have never seen any pictures of the Chinese using their hovercraft with mechanized forces. The pictures usually show either empty hovercraft, or at best now, we have a picture of one carrying infantry.
This with the added fact most of them were at the shipyard for years suggest some kind of issue and I suspect it is the turbine engines lacking power or endurance or both. It is fairly well know the Type 726 LCAC had some sort of issue but it was never made open. Supposedly this should have been fixed in the Type 726A LCAC but AFAIK they still don't have enough to equip all the Type 071 LPDs.
Same deal with PLA helicopters most are smaller types and most don't have ASW capability. Only now with the Z-20 variants entering the scene should this change for the destroyers, for the frigates they'll need to produce more light helicopters with ASW capability, but it could still take years for them to produce enough ASW capable helicopters to equip all the frigates.
Naval Z-9s can carry two torpedos.
Also the frigates have lower top speed than other modern frigates which have at least one turbine engine so they can reach 30 knots and only recently have they introduced variable depth sonar and towed sonar with Type 054A+.
The first 16 ships have Type 206 or H/SJG-206 towed array sonar, all passive, while the rest of the ships have Type 311 or H/SJG-311 towed active and passive sonar.
Iver Huitfeldt class of frigate is considered to be one of the top battle frigates in the world, and is all diesel powered. Its platform is the basis for the Royal Navy's new Type 31 frigate class.