What's the typeface's relation with Oled ?
It's purely a taste matter.
But true, I like the one of the Okto . But I won't change my D90 for that reason.
OLED is like a small computer display, made up of non-dedicated pixels. Traditional audio device displays have bespoke display areas, e.g. for the tracks on a CD player, so they have a fixed layout and content. With an OLED (or comparable technologies), you can do as you please when it comes to what you display and how you display it.
I agree that it’s a matter of taste, and I said as much is my original post.
To reformulate using your reference to the Okto, which uses a sans-serif typeface, how does it come that many Chinese manufacturers use an awfully unbalanced serif typeface (like I said, with narrow stems and too heavy serifs) when the Chinese culture has calligraphy as an appreciated art form. Think of street calligraphy with water, for example. It could be that the intricate, complex shapes of Chinese ideograms makes Chinese appreciate serifs more than we(sterners) do, but that’s just my crackpot theory.
Of course, it’s nice that these DACs are so good, all I can do is nitpick on typefaces.