What breaks first when a Shopify team starts growing?

A store with one or two people can run on pretty informal processes.

But once the team grows, things start changing quickly.

More people touching orders.
More handoffs.
More tasks.
More messages.
More chances for something to get missed.

For anyone who has grown a Shopify team, what broke first?

Communication? Task ownership? Documentation? Approvals? Customer support? Inventory coordination?

Would love to hear what surprised you most as the team scaled.