The reasoning for TA to offer FR pedals probably was simple. Assuming they sold both BSC and FR in the past, they probably just had one look at their sales figures, and FR outsold BSC by a big margin
Most guys who use traditional pedals in France ride old bikes, which have FR threads. And there are a lot of old guys riding in France, and many of them still use toestraps.
In Japan, the other big market, people probably put these on bikes that often are spec'd with old components, often FR.
Finally, if they made BSC pedals, they wouldn't fit in FR cranks. Since the opposite seems to be no problem if the dimensions are juggled carefully, it makes sense to offer the dimension that is most versatile.
Where, you may ask, does the American market figure in all this? Well, I don't even remember the last time I met somebody on the road on a high-end bike with toestraps...
Jan Heine, Seattle