It is difficult to say exactly what happened although the operation notes "should" be a good indication about what happened. Often the notes are sparse but in general should at least reflect the procedures that were performed even if there is little detail about how the procedure was performed. Which way was your septum deviated towards? Maybe the septum was deviated towards the side that has the smaller turbinate. It could be that the turbinate was naturally smaller because the deviation towards that side caused there to be less room and thus the turbinate was smaller.  What ENTs often fail to respect is that the nose forms in such a way as to compensate for the anatomy. So with the deviation, it would be common that the turbinate fits the space available. By straightening the septum, it could open up that side more. This could lead to some additional dryness. It is possible that the pain is a remnant of some surgical damage or maybe is a result of just being overly dry.

Still, if you do not have the breathing problems then you do not have ENS. With only a septoplasty, it is rare to get ENS symptoms so I would not be overly anxious and worried about that. Of course, it cannot hurt to get a second (or third) opinion from someone like Das. Maybe you can get a better picture about what it looks like from a doctor that will look longer than a few seconds and maybe something like an injection could improve the dryness.