Yes, I agree with your assesment and have notice this as well. Like, M'Benga has two larger stripes, but they are pretty far apart. And then so does Nurse Chapel. Exactly the same. This doesn't make sense if you want to be consistent with canon. Chapel had no stripes during the three years of TOS, making her an Ensign or an non-commissioned officer. Memory Alpha notes, however, that she was raised to the rank of Lieutenant by The Animated Series (TAS). I should also note, that even though hypotheticaly a Lieutenant, Junior Grade, should be either a dotted line or a one distinctly thinner line, I don't think we have ever actually seen one on screen. I wonder if the special (and Discovery added) white medical uniform will always have a different two widely larger bars regardless of rank. And when/if those personnel change into science/medical blue, will they have the standard rank insgnia. At any rate it is inconsistent. I would prefer they simply go with the TOS system, with the upgraded solid bands and not squiggly ones. I have also always wanted Star Trek to consistently have and use a set of enlisted officer rank insgignia for crewman, chiefs, etc.