Basically, for institutional investors who carry out large transactions to be able to use a public ledger, they would want to be assured of the privacy of their transactions. This would allow them to transact with ease of mind without being worried that they were being tracked every step of the way.
With the changes listed above already in place, only privacy, as well as lending and borrowing, remain to be implemented. Vet explains, though, that these are already on the way, especially with the XLS-66 expected to land soon.