I'd suggest it may be an indicator of how well the ICU is operating on a new disease COVID19.
This is a link to a New Orleans review of how to operate the ICU.
They achieved 40% extubation.
It is astonishing what foolish things one can temporarily believe if one thinks too long alone ... where it is often impossible to bring one's ideas to a conclusive test either formal or experimental. J.M. Keynes