> I rarely see doctors, lawyers, or most professions engaging in their practice outside work as a hobby
Doctors read through medical literature all the time.
I know plumbers who have fully decked out their house with incredible custom setups (e.g. hydronically heated walls), mechanics who work on their own cars on the weekend, contractors who live in fabulous homes they built themselves, and artists who work on their own projects during the weekend.
At the same time, many of my coworkers have interests outside of technology. It varies. A lot.
> (which might include sci-fi, fantasy, video-games, board games, certain types of discussions, and a lot more)
Hiking, sailing, martial arts, world travel, cooking, beer, animal rehabilitation.
> (which might include sci-fi, fantasy, video-games, board games, certain types of discussions, and a lot more),
Sci-fi and Fantasy movies have been mainstream for some time, and my non-engineering friends get together for board games as often as my engineering friends. Video games are played by 49% of Americans (Pew), equally split between men and women.
I've known men and women who have had cultural problems fitting into their teams, engineering and non-engineering.
Also in regards to the article, music is even worse than politics for % chance of finding agreement, if I brought up the latest \m/ concert I went to, I'd find maybe a couple of people in total who'd want to talk about it at my office! It'd be "how was it? Nice, ok, cool."