The more pieces involved, the more "opportunities" for getting off.
Even 1/64th of an inch variance of seam depth - over eight seams (1/64 x 16 ) is 1/2 inch. ((the 16 - one loses (or gains) from both pieces of fabric that were sewn together))
So - taking the few minutes to do the three strip test - using the ruler, fabrics, thread, and machine you plan to use - to make sure that one's cutting and sewing are producing the expected result is worth the time (and bother)