Central Idea for ECs

Here and there I see people talk about how it is better if someone’s extracurriculars have a certain theme tied to it. As an example, someone may have a mental health focus towards their ECs where they have done lots of volunteer work surrounding psychotherapy and research about mental illnesses.

My question is, does this actually pose any benefit to the applicant when it comes to reviewing their application? Do the admissions teams really care whether you have a certain theme or not?