It's mostly laziness on my part, but the intonation differences using Bb length
valve slides with an F attachment are not so great they can't be lipped into
tune, especially if you pull the F crook out a bit. The alternative is a
manual change on the crook, but pulling the F slide a bit flat is just as easy.
My point is that the stopping valve is very rarely used, and never
unexpectedly. The F attachment, once mastered, adds so much to the playability
and respectability of the instrument, it should preferentially be in place all
the time.
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