They do make communication more efficient, as long as everyone understands the definition. If they don't, then acronyms and initials quickly make the communication inefficient, or worse, make the person that isn't in the know feel excluded. In my professional life, I spend a lot of my time translating acronyms and trying to help people navigate the confusion of not knowing what things mean and wondering if they're in over their head, all due to the constant use of jargon.
My suggestion is to definite your acronyms the first time you use them or, if it's a short message, spell the whole thing out and don't mention the abbreviation at all.
That's a pretty good testimonial. Thank you for taking the time to share it with me.