Who decided that umpires shouldn't say "full count?" It's descriptive. It's short. Everyone knows what it means. Why did it become a problem to say it? But for the fact that someone told you not to say "full count" when you were learning to umpire, would you ever have thought it would be inappropriate?
Along the same lines, why are clinicians so anal about using, "Two balls, two strikes" rather than allowing umpires to say "Two and two?" Who doesn't know what "two and two" means? I've heard a clinician "correct" an umpire asking, "What is 'two and two?'" "It's four!"
NOT!
When you can't give even a little leeway in how you give the count, it isn't hard to figure out why people think that most umpires on TV look like robots.