Completely agreed with your thoughts/assessments regarding seasonal outlooks. I know I've mentioned this a million times but there is jut way too much emphasis placed on ENSO and seasonal outlooks...way too much. At the end of the day, the sample set of ENSO events and how a season responds is just way too small. Now...this doesn't go to say ENSO state or ENSO evolution should not be considered or addressed...it most absolutely should be, however, it should not get the weight it gets. Obviously as sample size increases and we have more data/results to work with knowledge increases and we adjust based on results. With the small sample size this leads to a very large standard deviation. Long story short...there are going to be many different types of outcomes from various ENSO episodes we have never encountered b/c of the small sample set/large standard deviation. For example, remember for so many years some said we can't get KU's during La Nina's...and then we got like 3 of them in the span of a few weeks lol.
Your last sentence there really ties everything together and explains it very well. There are just so many factors that we need to consider and even factors which there is very little research on. I also wonder how much attention this (NH summer) strong PV will get in seasonal outlooks. The PV is MEANT to strengthen as we move towards the NH winter but it's various processes which disrupt this strengthening. Does having an unseasonably strong PV leading into the winter favor a stronger PV which is more difficult to disrupt? Also, look at how much smoke has been emitted into the troposphere and I'm sure some has gotten into the stratosphere...just think of the volume. This most certainly has to alter atmospheric composition and maybe alter circulations, etc.