In my experience these kind of people just chill in the office if they are forced to come in, but appear busy by proximity and association with their coworkers.

In my experience these kind of people just chill in the office if they are forced to come in, but appear busy by proximity and association with their coworkers. When the most important metric is work-done and not butt-in-seat-hours, it can actually be easier for (effective) managers to filter out the ineffective employees.