I have a "hunch" that many great players lean forward while playing seated, often without a strap! Examples abound. But these very same players tend to lose the lean-in when they are standing upright, for example, to play in a band situation, with a strap. So it's not appropriate to compare seated playing with unseated playing. And if virtuosos like Mike Marshall and Chris Thile are capable of coaxing such great music from their instrument while playing seated and leaning in, I see no reason at all to dismiss this posture!
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