Ah, it's all about TOS and recreating TOS.
One aspect of working on Exeter
was trying to recreate some aspects of the original series that a lot of us liked but which are not really part of modern Trek to the same extent that they were in TOS.
A show like "The Doomsday Machine' has a "moral" or social message to about the same degree as a "don't shave the cat" episode of He-Man And The Masters Of The Universe
- what it really is, though, is an hour of action melodrama built around a guest character portrayed in broad strokes, executed as excellently as anything of the kind that network TV ever presented in the 1960s.