Ask ten students what they think of office hours and most will tell you the same thing: they're useful when you can make it, and useless when you can't, which for a growing share of students is most of the time.
Roughly a third of undergraduates at this university work part-time during the semester, according to the financial aid office's own figures. Office hours held Tuesday afternoons don't accommodate a student whose shift starts at noon.
A rotating or appointment-based system, already used by a handful of departments, would cost professors little and would meaningfully widen who gets to ask for help.