I wish they would go back to tearing fabric instead of cutting. Most places I buy fabric just cut, not making sure anything is straight or not.
I was helping a friend make a table runner and the sales person cutting started her cut on the exact measurment. When we started squaring up the fabric at home, she had cut it 1.5 inches shorter on the oposite side. We could not use the piece of fabric. I took it back and they cut us a new piece, made sure it was straight and gave an extra 1in.
Sometimes they are generious and give a couple extra inches which would take care of not cutting straight.
Sometimes they act like they don't understand why it needs to be straight.