OK .. since the OP asked.. this isn't hijacking :-)
You can get the full history of my apnea and septum and turbinates from my main thread..... however...
I have had long-standing apnea and I've also had long-standing enlarged turbinates and a mildy deviated septum.
When I used to get horizontal and lie down my nasal passages would often totally block or become extremely restricted.
This means I have been a mouth-breather for most of my life going way back to childhood.
Early in childhood my tonsils and adenoids were removed which helped but the turbinate issue remained along with the septum deviation.
In 2016 or 2017 I finally got an official diagnosis of deviated septum and enlarged turbinates. Prior to that I just got used to tolerating it.
In 2018 I had the septum straightened with some strategic hammer and chiselling.. I also had the turbinates reduced.
This helped open up the nasal passages but was not a "perfect" solution for me. I still get a little congested when I lie down and I continue to be 50-50 mouth-breather versus nose-breather.
If we remove too much turbinate tissue we can inadvertently get into a nasty condition called "empty nose syndrome" which, by all accounts, is horrifying.
The brain thinks you are not breathing (even though you are) and you spend every moment of your life believing that you are suffocating.
People become severely depressed and some even become suicidal because of it. Unfortunately it's irreversible and you can't put back the tissue you removed.
As a consequence, I told my surgeon that I don't want him to go crazy on the turbinate reduction.
EDIT: Some doctors are now trying to put back "bulking material" to enlarge the turbinates again.
Long story short... the turbinate reduction and/or septum surgery helped with my breathing but it was not a 100% remedy.
In addition to the above I have a larger-than-normal tongue (Mallampati class 3)
The tongue and the residual turbinate issue meant that I still had apnea even after the surgeries.
I can't say with any certainty if it was one or the other or both that caused the obstructive apnea.
I didn't begin looking for therapy for my apnea until Fall 2019.
Since then I threw myself at the subject and ended up buying an ASVAuto-capable machine and my AHI is now zero most nights with only an occasional single OA or hypopnea maybe once per week.
I'll never know if I could have achieved the zero AHI without having the surgery because of the order in which I did things.
Of course... as always... your mileage may vary.
Edit: Here's a link on Empty Nose Syndrome just to scare the living daylights out of you:
https://www.healthline.com/health/empty-...on-history