The consensus here seems to always be leave in SDR and use match content, but I’ve had no issues with leaving Dolby Vision on all the time. SDR content like youtube and TV shows that were never mastered in HDR look 100% fine to me. Part of the Dolby Vision spec is that it forces your TV into it’s most color accurate settings so why wouldn’t I want that as well? Using an LG C2 by the way.
Whatever works for you. Personally my projector isn’t the best at DV and I also noticed DV is great for one show and awful for another. Not that it was good TV but Shadow and Bone on Netflix for some reason was enough for me to finally just go back to SDR fixed and stop thinking about it. Simpler.