All I can add is that I've been seeing more updates (and more often) to the fare buckets shown in expert mode -- I even called in once -- and they said that the buckets that are being displayed in expert mode are out of date... I watch these all the time for our flights back and forth to Tokyo from NYC -- the buckets are changing often - much more than I've seen before....

ETA - I’m not sure that there is anything standard about saver business any more - it’s all dynamic and what was 80k one day for “saver business” could be 120k the next….