A sub or filter for each of the arxiv subcategories would make sense and would be easy to implement for papers submitted from the arxiv. As someone in physics,

A sub or filter for each of the arxiv subcategories would make sense and would be easy to implement for papers submitted from the arxiv. As someone in physics, i would most likely want to contribute comments in my subfield and just view top papers (or most discussed) from a combined physics super category.