"Broken" is a sliding scale, and it's unfeasible to refuse engaging at all times.

If you are a multi-billion dollar company creating a new integration, you can demand that your small supplier provide an RFC-4180 compliant file, and even refuse to process it if its schema or encoding is not conformant.

If you are the small supplier of a multi-billion dollar company, you will absolutely process whatever it is that they send you. If it changes, you will even adapt your processes around it.

TFA proposes a nice format that is efficient to parse and in some ways better than CSV, another ways are not. Use it if you can and makes sense.