Agreed that you can have real individual ownership. Not only that, I think that is the only way to be really "productive".
But I think that is beside the point.
Individuals are not fungible, but team members are - or at least can be, depending on how you structure your teams.
And as your org grows, you want predictability on a team level. Skipping a bunch of reasoning steps, this means having somewhat fungible team members, to give you redundancy.
The engineering parallel here is the tradeoff between resilience and efficiency. You can make a system more reliable by adding redundancy. You make a system more efficient by removing redundancy.
I blame Agile and the like for fucking up individual ownership by treating every engineer and every task interchangeable. You can't build expertise by working on a different type of task every sprint...
But I think that is beside the point.
Individuals are not fungible, but team members are - or at least can be, depending on how you structure your teams.
And as your org grows, you want predictability on a team level. Skipping a bunch of reasoning steps, this means having somewhat fungible team members, to give you redundancy.
The engineering parallel here is the tradeoff between resilience and efficiency. You can make a system more reliable by adding redundancy. You make a system more efficient by removing redundancy.