It's especially important for people trying to use lower-resolution OLED (e.g., for gaming) - the text fringing can look quite bad. At higher DPI it can be less noticeable, though horizontal lines still have noticeable fringes.

Here is a more detailed look at several different subpixel arrangements: https://pcmonitors.info/articles/qd-oled-and-woled-fringing-...

And encouragingly both LG and Samsung were demoing RGB (LED-style) arrangements at CES this year.