RGB strip isn't really better, it's just what cleartype happens to understand. A lot of these OLED developments came from either TV or mobile, neither of which had legacy subpixel hinting to deal with. So the subpixel layouts were optimized for both manufacturing but also human perception. Humans do not perceive all colors equally, we are much more sensitive to green than blue for example. Since OLED is emissive, it needs to balance how bright the color emitted is with how sensitive human wet wear is to it.

They've just have had issues manufacturing it, but there were several monitors from MSI, Asus and Gigabyte with Samsung's latest gen QD-OLED display announced (and reviewed) this week with RGB stripe subpixel layout, so we are there now (as soon as they are available), and this article is somewhat poorly timed.

The problem with strip layouts is if you rotate the monitor (or phone) you lose all the subpixel rendering benefits. OLED pentiles work better in all rotations.

Originally OLED TVs used different sized subpixels for different colors as part of their wear management. Red wears out the fastest so it would have the largest subpixel.

Peak brightness is most likely to suffer.