The ideal isn’t to erase the difference between design and engineering. Each side has its depth, taste, and craft. The goal is simpler: maintain a shared language of making.
There’s a healthy culture of grabbing the work that most energizes (or annoys!) you combined with giving ambitious tasks to one person, regardless of title or org structure or team, and just letting them be owner, full stop.
“What I’m talking about is taking your interests seriously enough to have the courage to stay moving. You can give stuff away. You can abandon things. You can tolerate failure because you know that tomorrow there is more.”