Why would you play a treble as if it were a descant?

1. To get the pretty tone.
2. Because it's the only recorder you have.

Granted, this is for solo playing only.

I attend a week of early music with skilled players almost every year. Believe me, lots of players suffer "instrument attacks." Playing a C instrument at 2 pm and an F instrument at 2:30 pm has a lot to do with it.