I can understand striving for perfection if not produce it myself. On the other hand, being accurate can make the process more enjoyable for me. Nothing is more frustrating than trying fit together things that have been cut or sown inaccurately. This goes back to my clothing construction days.
Grace, I am so glad that you are still sewing. My sister also has Parkinson's but she gave up quilting when she could no longer create the perfection that had been her joy.
I guess the bottom line to the original post is the "bottom line" for some companies. Quilters have always been able to create "perfection" with nothing more than needle and thread!