Why this fear of bias edges?
I'm not understanding the fear or caution expressed when bias edges are mentioned in anything. My first quilt was Ocean Waves and I used the disappearing pinwheel blocks with my 4-Hers. My view is that the stretch of the edges allows fitting opportunities.
If pressing is done carefully - pressing not ironing - and pinning is done, then the blocks can be completed satisfactorily. I'm currently working with blocks that my members have done for a group quilt. So far I've only had to reconstruct one block and I'm still not sure what the member did that was wrong. And I have had to add extra strips to the block edges because the some of the blocks vary in size - but I think that the quilt itself will be lovely. (I'll post when it's complete!)
But then I am not a traditional quilter. The idea of cutting small pieces and then sewing them together gives me hives....