Re: USPS no longer offers tracking for International Registered mail...
Common misunderstanding. We are referring to INBOUND registered mail and other service classes shipped TO the USA, that were previously tracked by USPS.com from the time they entered the country, until they were delivered to their USA destination. As of November 17, 2014, that service is no longer functioning and appears to have been "retired".
There was an update to the BSN service on November 17, 2014, the exact date the service stopped functioning: https://www.usps.com/nationalpremieraccounts/bsn.htm
Without the ability to confirm delivery to the USA destination from abroad, small international businesses are taking a tremendous risk shipping to their USA customers. Customers can file an INR (Item Not Received) complaint and be refunded for a product they did in fact receive. Without "Proof of Delivery", eCommerce sites such as Amazon, Newegg, eBay and Etsy, to name a few, will likely take the buyer's side and withdraw the refund directly from the Seller's account.
Small businesses can not afford DHL, which is about the only service offered other than their country's national post system.
Small overseas suppliers and small businesses depend on USA sales to keep them afloat. Approximately 60% of their sales (my guess, nothing official) are to US customers. This can turn into a nightmare for these smaller foreign businesses.