Whether an IBM hater or UNIX lover, I still recommend you check out the AS/400 or IBM i architecture. It was a very, forward-looking design from very, long ago. I found some slides to make it more accessible to busy or lazy folks. :) It was also resilient to attack in first form as a capability-based, computer system. This book has many examples with AS/400 predecessor being “System/38” if yall want to check those out:
