It seems there's been some effort to make it more broadly applicable. For example, some slides I found specifically mention they made effort to reduce examples from aviation in newer versions.

That said, for many applications following all of it is probably not worth it. It uses some very specific terminology with specific approved meanings for words that are commonly used. e.g "follow" can never be used in "follow these instructions", but in can be used in "follow the green lights to the nearest staircase". This makes a lot of sense, but sticking to one approved meaning for a hundreds of verbs and adjectives is hard word and requires specific expertise.