Adding a Failed Reason Column to the Contacts page would improve the ease of management for undelivered text messages. The Message Status column allows me to see a text wasn't delivered, but not the reason. Reason would allow me to Opt-out by Error Code and Reason rather than having to open each contact to determine why the message failed. This would help me with 10DLC compliance as well as reducing the usage of credits to send to undeliverable numbers.