That’s all well and good but it’s what everyone was telling themselves in the 90s, too, when everything was 71/73. I was one of the fastest people back then in both XC and gravity stuff and I certainly had no particular inkling that longer/slacker was better. As a framebuilder at the end of my racing career I was thinking harder about that stuff but what I (and everyone else) ended up doing was 72 HTA 29ers for quite a while.
Point being I’m not so sure we’ve “arrived” just because things have stabilized for a short while.
-Walt