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.
Don’t listen to all the naysayers. If you like the look of DV on standard SDR content, you can leave it on all the time. It’s your TV and your preferences. I personally leave DV off unless content is in DV, but I also tried DV on all the time and it was OK experience. Unfortunately I found some content did not render properly in DV, so I stopped that practice.