Once your project is bigger then one person, you gotta start talking to people, and if you’re talking to people regularly then you gotta keep some amount of track of your planned time so you can schedule a time to talk. Some multi-person projects can happen in largely asynchronous communication, some can’t.

I hate doing that so I work freelance, on a loose schedule. I still track my time so I can do things like “feel confident that I’m getting enough shit done fast enough to have money for rent”.

“Get shit I gotta do out of the way as efficiently as possible so I can do the stuff I wanna do at my own pace” is also a possible reason.