I pinwheel not only 8 seams, but also on four patch assemblies.....if you just remove the two stitches before you reach the connecting seam, there is no undoing of any seams...same principal as joining pieces...new seam keeps old one from undoing.....
I also press seams to the side rather than open, not for beading, I think batt makers have pretty much corrected that, but just in case when machine quilting, sewing machine needle going thru a thread can split it and weaken the twist of the strands.....being that the seam stitches are so small, chances are greater than in garment sewing...jmho