It doesn’t only last for two years, however it begins to degrade after one year of illuminating blue. This would reduce the color accuracy.

However OLEDs are also very bad at color accuracy across it’s brightness range. Typically at lower brightness their accuracy goes out the window.

This isn’t as bad on smart phones ( smart phones also apply additional mitigations such as subpixel rotation) however desktop computers typically display static images for much longer and so not use these mitigations afaik.