I think the public speaking part was a big plus for JW's when we had the TMS. Now, that is being watered down compared to what is used to be.
JW's simply are not taught to think and analyze issues, rather just learn some things and parrot them back to others. If you can't remember what to say, just tell people to go to JW dot Org to find the answer.
Also, a major weakness that many JW's have is the ability to write. A few good courses in college in the Behavioral Sciences (Organization Behavior, Psychology, etc.) force you to learn to analyze, seek resources, research and then write in proper APA (American Psychological Association) style with properly inserted citations and references. This is typically the standard used for any type of informational or research paper.
APA style is a pain at first with all of the rules for margin width, indentations, double spacing, capitalization, bullet points, citing single authors of a work, two authors, three to six authors, more than six authors, etc. Then, depending on type of work being cited (book, magazine, journal, blog, on-line), when to use proper case, italics, dates, page numbers, editions, etc. etc. etc. And then not writing in first person but in third person active voice. If you have had to write papers which conform to proper APA standards, you know what I mean.
In the end, I still find myself using a lot of the APA stuff for business presentations and I guess it adds a few points to your credibility on what you are talking about when everything is properly structured.
A "standard" JW learning to be a window washer while in high school simply does not learn this.
Rub a Dub