Why use phrases used by other churches if you are presenting a purely Christian message? It would obviously raise red flags.
What I said was: I use words/phrases "including" those used "more often" by the churches. I don't mean words that are unique to other churches, because I think that all denominations are junk. I mean words/phrases that ARE biblical, but JWs still shy away from and substitute with their own in-house lingo that has additional, extra-biblical implications.
For instance:
If I use a JW-ism to refer to a biblical concept, then that brings along other doctrinal baggage into the audiences minds. If I use a new/rarely used phrase, it gives them a fresh start to look at something from scratch.