Oled is much more than a subpixel layout ehich can differ per screen, purpose and usecase. Subpixel layouts are often selected on balance and subpixel durability. Some oled colors wear out faster, thats why they make some larger or smaller to balance things out.

It is a established fact that the chinese stole oled trchnology from samsung.

The normal Oled variants seem to be there in abundance, could order 1 now and get it between 6 and 9 days later.

I didnt use one, it affects brightness and contrast a little bit but also induces more glare. It stays always in a case anyway so I didnt opt for a protector. All my devices look like new still. Just I dont drop 'm.