It's an informative article, but the reality is that nobody cares. And I mean "nobody" in the approximate sense of 99.9% of music listeners. The reality is that our brains are more than happy to glue these nasty thirds to their hypothetical frequencies. Sure, they have a little roughness to them, but it's not a big deal, especially considering that most piano music from the 18th and 19th century is composed not to highlight the weaknesses of temperaments.
Also, equal temperament isn't quite the final word on piano tuning: https://en.wikipedia.org/wiki/Stretched_tuning