After all these decades, after all the obsessive fandom, there are STILL things yet untold?
When it comes to TAS, the redheaded stepchild of the franchise, that's not surprising. If you look at past reference books, they go into a lot of depth about TOS and TNG and such, but usually have only brief, cursory sections about TAS if they cover it at all (the first edition of the Star Trek Compendium
skipped it entirely). I don't think Scheimer himself has been interviewed about it all that much over the decades.