Open office and Flat company structure always felt better to me when I was a manager than a dev. If there's no doors or walls I can always go grab an IC and get a quick 1:1 for whatever I need. And if everyone is my IC, how efficient am I?! I'm glad that's past. Being an IC is more individually stressful, but I feel more like a part of the solution.

It's all explained pretty well in Paul G's Maker Schedule vs Manager Schedule.