When opening a diff link on mobile (such as one from a watchlist email), the desktop view is used.
For diffs between adjacent revisions at least (until MobileDiff can handle multipe-edit-diffs), diff links should redirect to the mobile view.
This would make my mobile workflow 10x better. I want to be able go from a watchlist email straight to the mobile diff view (and then thank people for good edits, yay!).