Interesting.... I did not know that!
here is another example from today... as you can see from the histogram, it is run up to the edges on both sides and technically, a bit more DR would have extended detail in the highlights and in the shadows.....
That's the histogram for the default conversion, which does not come close to extracting all available DR in the raw data (It's a CR2 file).
You could have large spikes on the left edge and right edge of the default conversion and a lot of clipping showing on both sides and still have plenty of DR left.
So what conversion works better?
You would have to expose so that only the pixels you want blown in the final are actually blown in the raw data. That isn't easy.
That will result in you having a lot more blown pixels in the default conversion than you want. You'll need -exposure or -highlights to get them back.
If there are dark areas you want brighter, you'll need +shadows for them.
The only real way to know if you're bumping up against the DR limits of your shot are to set -5 exposure and see if you still have some solid areas that are bright (those are almost certainly blown in the raw data) and then set enough +exposure and/or +shadows to make the darkest areas at the levels you want them in the final, and then see if they are too noisy for your taste or for you to see the detail you want in those areas.