it is similar in my case, I normally don't sing either. There are pieces that really show your playing skills and other pieces which don't demand very much beyond correct chords and a slow melody maybe with some decorative tones around. This one is one of the latter. It doesn't really show your skills, and with the romantic melody it makes more of a difference whether it is sung or not. So, I keep those songs in my repertoire, they are just not too useful as a demo for prospects to show your skills.