Good question! You will get an expert's opinion by watching the video by Sally Collins that will be available until the end of this month!
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Even if you aren't planning to do miniatures like Sally does, her precision piecing info is wonderful!
In the meantime, do my 1/4" test and determine if you need to be more accurate in your cutting, or your stitching or your pressing. And remember that the important thing is not how wide your seam is, but how wide is the unit after you have pressed it open!