If you look through the earlier posts on this thread, I don't think a single commenter mentioned Thailand as being a priority.
This thread is about anticipated future books--not most desired guides. This is the first we've heard of a new guide for Thailand, so there would have been no reason to mention it. In any event, many of the highest demand sites already have books in the works, so Lynx probably didn't want their first guide to be facing prompt competition, or be rapidly superceded.
And I'm really not sure that "hundreds" of additional species would need to be covered.
Robson's Thailand guide covers c. 950 species; his SE asia guide covers 1270. Numbers likely larger now after splits.
Regarding local names, I can't say how useful these are in practice, but it would hardly be a big deal to include, say, Vietnamese names.
Whether the goals of the series are good ones is a different question from whether Thailand is a good choice for the first book in the series. I'm only addressing the latter question. In any event, producing a guide to SE Asia that included local names from Thailand and Vietnam, but not Malaysia, Cambodia, or Laos would be sure to, ahem, ruffle some feathers.
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