I am actually very happy for you, that you got very good experience playing with JP ppl.
However, I just want to remind you not everyone there is like that.
Actually, I do see almost all the ppl replying are agreeing with putting stricter rules. (Maybe you have better understanding of Japanese than me. in that case, please point out which ones are "NOT support"ing)
Which is, again, somewhat sad for me because I am not of Japanese origin myself.
As to the part about thread being short, JP forum tends to use "Like!"s (as agreeing) instead of actually replying same/similar thing over and over again (ofcourse, there are times when ppl do that too) so what you need to count is not actually the page numbers, but the "Like"s on each reply.
(In that sense, I would NOT think 68 as a SMALL number)
From my personal experience, I had a few problems myself with DF in different languages.
The most serious one being a English speaking person in a JP group, was trying to assure the group he knows how to do this, but the group DID NOT understand that "statement" he made.
I kinda do the translation when things like such happens, but...NOT every group will have someone who knows both languages ofcourse.
In Short: It's your freedom to do it. but keep in mind people COULD be hating you.
I love to see people from different culture working together, but just raising "another view" on this issue.