In all this back-and-forth, we (ok, you techies) kind of forget to answer the above? In one sentence first, please (for us, non-techies), and then you can explain it further for all the geeks out there
Sure. Expose properly (for either your raw data or JPEG).
Or: Expose when possible for the best quality data.
No different today then it was 30 years ago with transparency or neg film.
Again, this is photography 101. If you think that setting your exposure meter and an ISO is all
you have to do, you're ignoring an important part of photography. You'll still get an image. It could be award winning. You might not care about a tad more, maybe a lot noise (or less photons). If you understand the role here, then at least you can make a decision to capture an image just as you and other photographers captured images on differing media since photography was invented. ETTR is simply adjusting the exposure rational for the process which should provide the best quality data. Can still be a butt ugly photo!