I think it really depends on the severity of the deviation and blockage. Before I I had the surgery, the difference between nostrils was significant. Left side was normal and the right was like breathing through a very small diameter straw. Post surgery, I sleep much better and rarely snore. I feel more comfortable when running or biking long distances while only breathing through my nose. Do yourself a favor and get an evaluation if you have a blockage or deviated septum!

After the deviated septum and turbinate (?) reduction my breath improved noticeably, my sleep got better, my headaches were significantly reduced, and anecdotally I felt a lot less anxious. The ENT doctor told me "things were pretty deranged back there" after the surgery so it makes sense this would help.

That said, I still do the neti pot every day since I wouldn't say my breathing is "completely" clear.

One of my friends had this issue for years and he said that it did wonders for his sleep quality and general clarity of mind. The recovery period was apparently terrible -two weeks of not being able to breathe through your nose at all while experiencing significant sinus pressure/headaches- but it must be worth it because he said he would do it again.