Yes..rear filter. I have a NiSi filter system for my Sigma 20mm but as well as it works it sometimes is just more hassle than it’s worth. I always think twice about packing it up when I go out and shoot. I’ve never been out with a lens that uses rear filters so I can’t speak of actual “work flow” good or bad experience but I’d suspect it’s at least less cumbersome than the NiSi type rigs.
Like I said I really loved what I got out of the 14-24 in not only landscape stuff, but really creative (at least for me) everyday stuff, so rear filters would just be icing on the cake!