Oh, I don't know about that.
Left to right for center justification could be anywhere from 1/8" up to 1/4" on a 6' or 8' wide parameter.
1/16" for up and down is too much on a 6" wide piece of even worse on an 8' wide piece
Remember, if you are 1/16" high on the left side and 1/16" low on the right side, you're off by an 1/8" all total. In 24", that's a lot. If you're off the same proportion on an 8' wide, you could be off by 1/2" up and down. Yikes !!
If you measure your distances, you shouldn't really be off by anything, unless you're sloppy. How hard is it to keep something straight ?? I mean, today we push a button, it cuts the stuff straight, we tape it up straight and the only place we have to be careful.... most of you are saying you can eyeball it..... and be off by fractions, but big fractions ??
Not here, unless I'm doing it, but then, I rarely touch this stuff anymore.