Delay reasons used to be more straight forward. They seem to be more vague and utilize terms that catch-all for most situations.
Recently, I was on a plane that had a mechanical problem. A part in the engine had to be replaced. Captain did an excellent job explaining it while we waited. Understandable. However, in correspondence with 1Kvoice later on, they claimed "the issue was a broken part on the engine that was caused by environmental conditions"...which was outside of their control. Again, I get it, thats what would happen in a hail storm. But this was LAX and dont try to escape an issue by waiting until after the fact to determine another reason.