store/index.js的商品修改changeCartItemInfo 函数

changeCartItemInfo (state, payload) {
      const { shopId, productId, productInfo, num } = payload
      const shopInfo = state?.cartList?.[shopId] || {
        shopName: '', productList: {}
      }
      let product = shopInfo.productList[productId]
      if (!product) {
        productInfo.count = 0
        product = productInfo
      }
      product.count += num
      if (num > 0) product.isCheck = true
      if (product.count <= 0) {
        delete shopInfo.productList[productId]
      } else {
        shopInfo.productList[productId] = product
      }
      state.cartList[shopId] = shopInfo
      setLocalCartList(state)
    }

这样写可否，我直接把count为0，用“delete shopInfo.productList[productId]”给删了。实际开发也是对这些数据软删除吗，有什么深层含义吗，请老师告知。