Ha-ha-ha! I have no idea why anyone would go to the trouble of pulling threads. I do unfold fabric, press, align selvedges, and then re-press any fabric that is not flat at the fold when purchased. I also don't buy fabric that is obviously twisted or stretched. I do use a 24" ruler to cut ends straight. Then I cut my pieces. When working with scraps ( as I do VERY frequently), close enough is close enough. I do not prewash, I do not starch. Guess what? No problems. Perfect straight of grain is a myth in my book anyway.