I find it so much easier to appreciate the shape, form and texture of a photographic subject if it is presented in its simplest form. Colour desaturation is one method of such simplification. An early and pertinent lesson learned was that if an element of a picture is not essential in conveying your message, then remove it.
The result of a winters walk along the River Wey in Surrey. One of two images I made that day some twenty years ago using an Olympus OM1n fitted with a 28mm lens and loaded with Fuji Reala colour print film. Since it was such a grey day I have always thought it reproduced better in monochrome. This is a scan of a digital print that I made in 1998.