The writer has not responded properly to the question. There is a single opinion that must be defended in this representation in relation to the direct question provided in the prompt. That qestion is:
DO THE ADVANTAGES OF SHOPPING IN THIS WAY OUTWEIGH THE DISADVANTAGES?
Seeing the format of the question, it does not lend itself to a comparison discussion that shows the merits and demerits of both sides. Rather, the writer must indicate a support for one clear opinion. Without that clear opinion in support of one of the two sides, the essay will be scored based on a lack of clear opinion in relation to the given question. There was no "compare both sides" part of the instruction for the discussion to merit even a partial scoring consideration.
In terms of task response and relevance, the essay has failed. That lack of proper representation as is relevant to the question means that no matter how well he believes he has discussed the topic, his prompt deviation and lack of relevant response will lead to a final failing score. That is regardless of his performance in the scoring sections.
The correct response is: The merits ( or demerit depending on the writer's choice) of this shopping method outweighs the merits/ demerits (writer's choice) based on 2 reasons. First, (Indicate Reason 1). Second, (Indicate reason 2).