Now in the watchlist, the user can filter only one namespace or all but one. But there are cases when the user may want to see edits from several namespaces. For example, after a vacation, it is more important to first watch changes in content namespaces (articles, templates, categories, files), and only then changes in metapedic namespaces.

So, what I suggest is to change the namespace selection in the watchlist to be the same as in the search.