Why waste time say lot word when few word do trick?
In all seriousness, these are good restrictions to follow when writing user-facing error messages. Developers tend to complicate the language, leading to more confusion.
ACE isn't for error messages or prose, it's for computers to understand natural language without needing an LLM (my own description). The idea is that ACE defines a strict syntax for English whereby computers can parse it reliably and human can read and write it reliably - just like SQL, but English.
In all seriousness, these are good restrictions to follow when writing user-facing error messages. Developers tend to complicate the language, leading to more confusion.