I do not square my blocks unless it is part of some shortcut process. Squaring often results in ruined points, where fudging would have kept them perfect. If my block is more than 1/4 inch out of size, I remake the block or make another and use the odd sized block in an orphan block quilt. For my orphan block quilt, I add extra sashing, and then square it. People don't notice that the sashing is slightly different sizes when all the blocks are different anyway.
If you are reasonably accurate in the first place, there is no need to square up blocks.