Why does nobody talk about the guilt of logging off early after finishing your work

Last year, my team finished a huge report by 2 PM on a Wednesday. We all just pretended to work for two extra hours because the boss was still online. I finally closed my laptop at 4 and felt like I was doing something wrong. That fake busy culture is so pointless, it just burns people out. Now I shut things down when my work is done, guilt trip be damned. Took me a while to unlearn that anxiety.