A WIP thread for a game, IMHO, has different purposes as the work proceeds. It might start out as a recruitment thread or a pre-announcement. It might then become a place to talk with other folks who are helping with the game for lack of another meeting "space", or it might become a place to let folks know how the game is progressing. It also becomes (or can become) a bit of a development diary to help the author(s) remember how he/they decided to do something and why. Heck, I suspect that when I get through the current game, take my detour into a tile based game, and then come back to finish Camp Handiba come heck or high water, that having that old thread there will help me avoid making some of the same mistakes I made the first iteration.
Occasionally (as with my current WIP thread), it can become a place to share tips and hints for the rest of the community as well.
Personally I've never understood the eroge convention of weight/height/blood type since I generally just want to see a picture of the character, and a short sentence or two about what their personality is. I know that in the "home" market that blood type is considered to be something that adds to the personality - much as a Zodiac sign is in some US venues.
In any event, at the end of the day it comes down to the game itself. If the thread is distracting from the game, then perhaps it's time to let it go for a while and concentrate on the game itself

