When order access is required, Mechanic defaults to requesting access to the last 60 days of a store's order history. Users can choose to give Mechanic access to all orders, across the store's entire history, by enabling the "Read all orders" option.
Mechanic has a platform policy of requiring as few permissions as necessary. As such, it uses Shopify's read_orders OAuth scope, which covers the last 60 days of order history. Enabling Mechanic's "Read all orders" setting results in Mechanic requesting the read_all_orders scope instead.