The fact that there are many different pixel layouts on phones is kinda irrelevant since they've largely all converged on retina resolutions for their viewing distance, making subpixel entirely pointless.

For this reason, to my knowledge no one has ever bothered designing pentile subpixel rendering or whatever. Like I'm sure there's a cute tech demo but no one has any reason to seriously design and ship such a thing.

Same situation with the vast majority of macs. Apple just disables subpixel at the OS level since most things are retina anyway.

It still has its practical applications when you have the kind of userbase Firefox or Chrome does, but yeah it's increasingly easy to just Not Bother.