The plugin picks rates well, but it doesn't know your business rules. If a fragile item needs a specific carrier regardless of price, or an order headed to a customer who paid for two-day shipping needs a different cutoff than your standard orders, someone's still making that call by hand every time it comes up.
Stores selling internationally run into the same wall the main Shippo page covers: customs values and HS codes need to come from your real product data, not get typed in during checkout. The WooCommerce plugin doesn't pull that from your catalog on its own, so we connect it directly instead.
If you're running more than one warehouse, or syncing WooCommerce with a separate inventory system, the plugin's single-store assumption starts to show. We build the routing logic that decides which warehouse fulfills which order, and the inventory sync that keeps every channel honest about what's actually in stock.