I preface my comment that my opinion is as a person who satisfies themselves with finding the seed word (or should that be seed word), in each game.
On face value, I am inclined to run with Alan, based on including specialised words, such as fauna or flora names, medical or sporting term, and the like is fraught with nuances and arguments for and against. As at best it would be included as rare, I see no problem at leaving it out, as there are those who seek all words, and such words may be unfair to them somewhat.
As for including words based on “reputable dictionaries”, that is just going down the rocky “well read person” route, which while paved with good intent, is simply a problem waiting to happen. I am reasonable well read, and take an interest in the world around me, but I must admit there are times where I see that phrase, and think it is used more to make the person questioning the word feel inferior, rather than the commentator actually being well read. In many of those instances I think the phrase more often means “bloody lucky to guess it!”.
So to reiterate, happy with your decision Alan, and happy days to all.