Russ,
I certainly wouldn't try to change your mind....you couldn't change mine either... but that's okay...we're old enough for it to be okay to be set in our opinions.
I do, however, disagree with your statement,"that most solo acts simply couldn't handle playing in a duo or group if there was a lot of extemporaneous playing "off of each other" going on.
Most solo players that I have met are, more often than not, extremely capable players...it would a more appropriate to say that they "wouldn't" play in a group, rather than "couldn't".
They usually go solo because they got fed up working with incompetent sidemen.
There's also no where to hide when you are playing solo either...you are either good enough to cut it, or you don't get asked back.
The music business is a cruel and shallow money trench, a long plastic hallway where thieves and pimps run free, and good men die like dogs.
There's also a negative side.
All the best to you, my friend.
Ian
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Remember to leave good news alone.