Not sure what you mean, since you quoted my post to ask the question about the source of the quote. Later in the same paragraph, I wrote about often hearing arco teachers talk about using only as much left hand force as needed and no more. In my experience, jazz players with a full sound tend to espouse the same concept but with the caveat that it's better to err on the side of "slightly too much force on the stop" rather than "cutting it too close" since once a pizz stop has been compromised there's no way to bring the note back. A player who is playing with a bow can deepen the stop and revive a note that flags after it has been struck, while a person without one can't. It was just a personal observation and not an attempt at any kind of controversial statement.
Thanks for clarifying, Chris.
I just had never heard of the concept of varying LH "force" to suit either pizz or arco playing. While a "compromised" or anemic arco long-tone can be resuscitated by perhaps increasing the LH force, there are many arco staccato/accented bow strokes that require the string to be fully stopped in anticipation of the bow stroke, just like a pizz note. It's been my experience that using (probably) slightly more (as opposed to the 'exact' amount of) LH force is the surest method for ensuring a full, speaking note, when bowing legato, accents, or off-the-string articulations. The beginning/attack of a note, whether pizz or arco, legato or staccato, p or FF, is either cleanly executed, or not.
When playing legato, (pizz or arco), the challenge is to maintain LH contact and weight (thru the note, thru the shift, and into the next note), while maintaining a loose/relaxed LH. Collapsed fingers are a very inefficient system for transmitting that weight into the string - and collapsed fingers require an over-exertion of the LH system, in an attempt to adequately stop the string. The excessive tension in the fingers also hinders the departure, movement and arrival of the hand as it shifts.
So, I teach and approach playing (LH) legato quarter notes the same way, whether pizz or arco. YMMV.
Thanks.
don kasper