I would also think some artists have different idea what "project" means. Some consider project just as another band. While for others project is a temporary, goal-oriented undertaking. Goal might be even something such as not really knowing what direction to go with your main work. Having urge to create, but what exactly. Recording CDR under project name, giving out to handful of people or uploading online, might give new ideas, inspiration, direction for the "main project". Some may not even consider project very consciously. It can be just the gut feeling, why something is "XE", why not "Bizarre Uproar".
Some people may argue that why publish all side project recordings, why not just keep them as "rehearsals" or give out privately to peers for comments. That is option, but also how far this is from doing it in form of couple dozen tapes or bandcamp upload? It's not like anyone is forced to get 'em all.
I generally like that projects have reason, well defined and restricted form. It's like spin off, that can be all linked to GRUNT, but it takes specific sound, specific theme or approach. Temporary nature can mean either restricted time or when the approach has been done to point there is nothing except repetition to do. Then project can be laid to rest.
It is sometimes revealing to return to old works. Like upcoming Grunt album, which is intentionally attempting to push forward, into things and sounds I have not done before. Kind of. It is still very much traditional song oriented Grunt sound, but curiously when I was listening some of the reissues of recordings I have done 20 years ago, it was almost amusing to see how this push to new directions is still so strongly bound to unconscious style and taste I have.
That is good sign, actually. That there is certain spirit and character present, even when doing "something else".
However, I do also understand someone who makes projects even when there is no logic or reason. Putting out same sort of stuff under other names. I mean, what would it be if there would be... 100 new Richard Ramirez full album uploads next year? I do prefer that he uses other names too.