I think you’re right. Having it as big as Reddit or other social media platforms wouldn’t be good. But I would like to have most communities for medium populated hobbies to have a popular enough comminity that I can not use Reddit for it. Right now, even some relatively popular communities have no members and no post generation.
Really depends on the place of work. I work in the IT of out company and my PC isn’t monitored. My door is constantly open though and there are a lot of people passing. Me looking at the screen is normal and part of my work. Me looking at my phone is always seen as me not working.