Method claims should usually use the steps of the method and the technical features of process conditions to define the object of the claimed protection. In the claim, both the structural features of the product and the steps and conditions of the method and other technical features should appear. Generally not allowed.
The appearance of structural technical features in the characteristic part of a method claim, such as describing the specific structure of product components or related devices, will cause confusion about the type of invention.
For details, please see the 2nd edition of "Patent Agency Practice" by Wu Guanle, P235.
You said that if there are no product features, the method features are not clear?
I don’t know what the situation you are talking about is.