I'm probably guilty of adding 'venerable' to the odd design or two. However, it's not by design.
Yeah, I'm kidding around there. As Geoff mentioned, most TROs are written by several writers in tandem. Rarely is there much communication about word usage overlap between entries, usually the focus is on creating an interesting story.
I'm curious though, I'm not inclined to associate admirable, aged, august, dignified, estimable, experienced, grave, honorable, honored, matriarchal, noble, patriarchal, philosophical, reverenced, reverend, sacred, sage, sedate, serious, stately, venerated, wise, worshipful, worshipped with robots.
I suppose that still leaves esteemed, grand, imposing, and revered, most (all?) of which are used with some frequency as well.
The problem is, if you're trying to describe something a few dozen times, you inevitable get some overlap in word usage. Multiply that with the number of writers, and the amount you counted is arguably low.
Paul