Yes, the post should really have a [2008] tag. These are not current models.
Amazon still has some 555s but the top hits for the 595s list them as discontinued. I was trying to determine the price difference since I didn’t spot it in the article.
It was a somewhere around a hundred bucks, as I recall. The argument you're making wouldn't necessarily have been a bad one in its day, but its day is long past; the current successors of these models, the HD 569 and HD 599, differ in price by $20.
Yeah I don’t think I’d be too keen to disassemble my headphones and potentially break or chip them to save myself the price of lunch. If it was a difference of half the price? Maybe. But not 15%.
In any case, for less than the 595's original MSRP, these days you can get an HD 6XX that very perceptibly outdoes both 5-series models in frequency response. Yours is more of a 2013 complaint than a 2023 one, I think.