Maybe my misunderstanding is based on the nature of these assignments. My impression is that this sort of exercise is to help people build up a reel for job applications. Some FXWARS challenges are geared towards a compositing reel, some are for an FX reel. But for a modeling/animation/texturing reel? There’s already a ton of challenges out there in those categories.
While I think that “FX TD” is probably the most generalized position out there, as we have to have our hands in the most honeypots, a reel with only great models, animation, texturing, and rendering won’t help a whole lot in terms of getting an FX TD job. It’s good to show you know the whole pipeline, but you should also show you’ve got an emphasis on one thing.
But maybe I’m thinking in an overly cut-throat manner about this, and it should be more fun than anything. 
