For instance, if a student is studying Philosophy, they can have an advisor whose background could be Biology and could also have other advisees who have other polarizing concentrations/FoS.
I'm personally pursuing an ALB in Computer Science but my advisor's background is Music. I don't think it's a good fit. I may have specific questions about the industry, organizations, or certain professors or research efforts in the university but I believe I'm missing out on those opportunities and connections if my background doesn't match my advisor's.
I'm not saying I'm looking for an advisor who personally studied CS when they were in college but at least someone who works directly with the CS department. Someone who's updated on the CS specialties, national scholarships and internships, graduate school guidance, and can provide more than just picking classes and other administrative responsibilities.