The consumables you've reviewed above are the elements that wear out so quickly. That's why new industrial sewing machine spare parts must be bought with a margin. Without such trifles as regulators, tension screw-nuts, shuttle mechanisms, bobbin cases, mounting brackets, needle plates, knives sets for overlocks, there won't be correct threads fixation, as well as the ability to perform various operating options.
Make it your rule: change sewing parts long before they broke. After all, by delaying the replacement process of breakdowns, you doom other parts that are connected in one mechanism.