Comment by johannes1234321

I think a key factor is: XML offers so many ways to serialize, you always have to decide in the individual case what the structure should be, what's an attribute, what's Text content, what's it's own attribute and those are important choices having impact on later changes.

With JSON you can dump data structures from about any language straight out and it's okay to start toying around and experimenting. Over time you might add logic for filtering out some fields, rename others, move stuff a little around without too much trouble.

Also quickly writing the structure up by hand works a lot faster in any editor, without having to repeat closing tags (while at some point closing brackets and braces will take their tribute)

However I agree: once you got the XML machinery, there is a lot of power in it.