Grammar, terminology and spelling are always in flux. One of our founding fathers said that 'anyone who cannot spell a word in more than one way was a fool'. Standardization of spelling and grammar, rigid rules and standards are a relatively recent concept. Most of it taking hold in the 1800s.

Many of the finest pieces of literature are full of grammatical errors. Are you going to say Joyce or Shakespeare weren't good writers because they failed to follow modern grammar and spellings?

Technical writing often deserves closer attention but specialists within a field often don't use normal language. Instead they use slang, acronyms, and words-of-art. Most of which are not found in any dictionary.

English is particularly adept at adapting and absorbing anything useful.