I was excited for this standard a few years ago, but I've come to believe it's missing understanding of its domain.
For example, Dynamic Configs is an important and relevant concept yet it's only mentioned briefly in the team's meeting notes & blog. Similarly, the spec tries to define how an "experiment" is different from a feature flag, but ended up giving up and leaving their attempt as a rough draft https://openfeature.dev/specification/sections/tracking.
IMO, feature flagging is a red herring for the larger problem of feature control. That perspective is not defined, so I'm doubtful the proposed standard will integrate well with the more advanced use-cases of enterprises, e.g., experimentation.