To be clear - LUTs can be used for grading, but should only be used in specific circumstances and/or for specific uses if it can be helped. A LUT isn’t necessarily a colour space transform, though it can be used as such.LUTs are not for grading. They're for transforming color spaces.
Depends how you define ‘most people’.From what I've seen, most people grade for Rec 709, right?
If you told the converter your source material is in, say, REC709 when it isn’t, that could cause you some issues.Is that because I chose to grade in a different format than the DCP converter was set for?
You can record straight REC709 ProRes on an Arri.say I record in Pro Res, Arri camera... Would I take that footage and use a REC 709 LUT to get a better idea of how it will look on a projector as I grade it?