Does in-school suspension (ISS) actually punish students, or does it just give them a quiet day off?

Does anyone else feel like in-school suspension (ISS) barely counts as a punishment anymore? At my school, getting sent to ISS basically means sitting in a quiet room for the day, doing some work if you feel like it, and sometimes just sleeping or messing around on a Chromebook. I’ve even seen students joke about wanting to get sent there because they know they’ll get out of regular classes and have almost nothing to do. Meanwhile, after-school detention actually takes away your free time, which seems like it would make students think twice before getting in trouble. I get that detention creates extra work for teachers and staff, but if ISS is basically a quiet day off, what’s the point of having it as a consequence?