If I were working at PGM I would conduct a little survey.

1) How many existing BIAB customers use multiple choruses?
2) How many do not?

3) How many new BIAB customers use multiple choruses?
4) How many do not?

The answers to those questions would determine what the default setting is.

I would wager PGM will not lose or even upset a single jazzman by changing the default to 1 chorus as long as the option exists to change the default back to 3 or 27 or whatever!

I would also wager that the answer to #3 above is "the vast majority". So why in the world would you subject every new user to a quirky musical remnant from the past? The answer, of course, is I would not!