[ghusbands]

I believe part of the reason is that it was never fully compatible with screen rotation, often still assuming RGB order from text-left to text-right. Another part would be that the world is moving towards much higher resolution displays, where the effect of subpixel rendering is negligible.

[Quppa]

It's a combination of what you mentioned and incompatibility with APIs like Direct Manipulation. Raymond Chen explains it here: https://blogs.msdn.microsoft.com/oldnewthing/20150129-00/?p=...