Yes I think it was a cumulation of these things. (I am adding more points as I become aware of it. I never really considered why I stopped going, but I knew that I would never go back to wework).
1) Having to wear a mask for 8 hours a day. I couldn't breathe properly. Also, generally poorer ventilation compared to my apartment -- I sit beside a window.
2) Couldn't freely engage in meetings -- especially the technical ones. I was the only engineer there and I could feel how flabbergasted people were of what I was saying.
3) Constant dread of hunger; at home I always had snacks, fridge nearby, but at wework I had to either responsibly pack the lunch/snacks or routinely go out the convenience store.
4) Exhaustion from the environment stimulus. What I mean is, my mind is always subconsciously scanning the room (cleaning lady, elevators, telephone ring, coworker A-Z). At the end of each day I was mentally tired which led me to skip my gym workouts. Now that I'm back home, I have been back to regularly hitting the gym.
5) No large screen monitor; context switching for screen real estate is also exhausting.
Overall I think my experience at my employer could be different since point 2, 3, 5 would be mute.
