Getting OT now, but to answer the question, ATC's care, and professional pilots care. Theres nothing worse in a busy R/T environment than having the frequency taken over by some guy (or girl) who uses 20 words to say what could (should) be said in 10. As RS said, standard phraseology is in the books for a very good reason. Is it going to cause a crash? Who knows, but I can think of plenty of scenarios where it could.