Actually, I kind of cringe when I hear the Scientology lingo used. It reminds me of the "thought-stopping" mechanism it was designed to implement.
I believe it was Dr. Lifton who wrote about that when he wrote about totalitarianism. Great treatise if you can find it.
Essentially, if you adopt the habit of pigeon-holing/catagorizing with these catch-all phrases your brain stops searching for way ways to articulate what you're really experiencing.
Case in point: you have an obnoxious trouble maker working around you who gossips about everybody and is always looking for ways to piss people off, you call him an SP or suppressive.
Unfortunately, you have a good friend who loves and cares about you but keeps trying to talk you out of believing in LRH or CoS and goes to great lengths to get you out---the term SP or suppressive also applies.
Given this limited catagory, you may well come to think of obnoxious trouble makers and worried/concerned friends as one and the same. Policy would dictate that you handle an SP with the same formula so why would you differentiate when you've tagged both with the same name?
The same holds true for the term Dev-T. Dev-T can be used to describe some one who is lazy and a goof off and ends up failing to deliver on their part of a work load OR it could just be someone who's in failing health and doesn't deliver the goods on time because they're sick and under stress, even though they're trying as hard as they can.
When you slap a thought-stopping label on the end product and not on the intentions behind the delivery, you end up being callous and unfeeling for those who could use some empathy.
All along, these auto-responses for a wide variety of actions or behaviors tend to stop the brain from thinking through the situation and your ability to diagnose and discern with the appropriately descriptive words causes the mind to atrophy---not to mention the feelings attached to those defining terms.
I'm sorry, but pigeon-holing and catagories tend to choke the life out of free-thinking word association. I can't find any reason to resort to LRH's lingo when the brain is aching to describe things more succinctly.