Non il est encore en phase d'optimisation. Le framerate joue au yoyo donc impossible de le sortir dans l'etat actuel mais le jeu n'est pas 🔪— 🚀 Ubi-PandaR0o 🚀 (@TW_PhantomLord) August 26, 2017
Well here we have some more info that explains why Steep hasn't released on Switch yet. Most importantly, the game is still coming, so says the Ubisoft Montreuil dev above. He also points out that the game is currently undergoing optimization, and they are working on framerate issues. Obviously, no time frame for release was given. Thanks to Juan for the heads up!