What is completely unnecessary for some does not become the same for others. It is frivolous to adjust to your criteria a technical product used to satisfy a priori subjective auditory perception. This will become unnecessary when the production of operational sound amplifiers is finished, but for now, be patient.There are differences between general purpose op-amps and those designed for audio. Some parameters are more important than others in those applications. But implementation is still king. A really good engineer will be able to design an audibly transparent circuit around a "low-tier" op-amp, and upgrading to a fancy OPA won't be a scam, but it will definitely be overkill. The most fantastic audio op-amp in the world won't help a really bad engineer.