I've also been working half of my career in 1-person silos. The freedom was great but the stress lead to more than one burnout and said belligerence. Luckily not that extreme but it obviously took me a while to realize how much better it is to work in actual teams that are managed and where responsibility and knowledge are shared. At 2 workplaces I had to own everything from Desktop IT over actual development to product. There's much to hate about Agile and Scrum but I think the mentioned work mode is becoming a thing of the past.