Converting RGB to Gray, why does PS ask about flattening image?

When I have a layered RGB image and change the mode to Gray, PS asks whether I want to flatten the image (thus losing layer information).
Why is this, I don't see why this is desirable or common?

Why is this, I don't see why this is desirable or common?
Because a grayscale image has only ONE color channel Jace. Look at your channels panel. Thats why converting your image into grayscale MODE is a destructive process, and needs to dump all your layers.
There is a non-destructive way to do it using an RGB Smart Object embedded in your grayscale document, but this may be a little beyond what you are trying to do?
There are two good(ish) ways to make an RGB image into a grayscale: One Zeno has told you is to use a Black & White adjustment layer. A less flexible, but also less damaging method is to use a Channel Mixer layer with the Monochrome checkbox.

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