I'm with peckish on liking the ability to get matching to work well with bias edges. Part of that probably comes from my years of sewing clothing and that being a standard technique for getting things to fit well. I will certainly say that when I first started piecing and only used squares and rectangles I sometimes missed having that little bit of "give". And I will also say that my first OBW I should have considered using starch because I chose a fabric that was not very crisp.