I kind of think these are silly, but for a different reason than a lot of others.
To me, a single malt beer is a regular thing. My Pils is 100% Pilsner Malt, my British Summer Ale is 100% Maris Otter, and I make a Dunkel that is 100% Weyermann Dark Munich.
They are all delicious, interesting beers, not novelties.