Why are RenderTextures readable?

Unity Engine
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1

Docs say that Texture.isReadable should only return true when a texture has cpu side pixel data which RenderTextures don’t have, yet Texture.isReadable always returns true for RenderTextures. Why?

If docs are inaccurate, what does Texture.isReadable actually mean?

2

I can only guess.

I think, isReadable means that there is a CPU side buffer for the pixels, but doesn’t mean that it is up-to-date. You need to call ReadPixels or AsyncGPUReadback to update it from the GPU.

Why is it true for RenderTextures? Probably because of this