<p><a href="https://wiki.openstreetmap.org/wiki/API_v0.6#Details_of_a_user" rel="nofollow">https://wiki.openstreetmap.org/wiki/API_v0.6#Details_of_a_user</a> already returns the number of changesets, and it is available via the web UI (even when not logged on).</p>
<p>I suppose one could argue that iD provides a tad more information (the number of changesets when the changeset was created), but it doesn't seem to be that useful really except if you want to put somebody on a pillory for past sins.</p>

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