Different reasons. Mine is on the table and I use it more like a desktop. It will just idle when I'm not around, because I come and go often. My current uptime shows on Debian 30 days, 49 min.

Although... 30 days is maybe a bit misleading, because I ran some heavy shaders without thinking that triggered the GPU watchdog and forced me out of my session. I think killing all user processes is almost like a reboot, although not according to uptime.