This clip is well worth watching :
He addresses just those things I've said earlier. First:
1. That the shoulders tense up when sitting down. And the importance of shoulders to be "hung down" and relaxed at all times. He makes a really good point there.
2. The importance of your arms length and how tall or short you are as a person. He had long jangly arms. Not every one has.
3. The DIFFERENCE of angle you have to keep when doing A) regular finger picked bass B) playing with a pick C) Doing lots of thumbing, slap, and popping.
See, point 3, requires all different and can't be pulled off convincingly and conveniently with Gary Willis idea. Take a good look at Mark Kings "chin" position of the bass, just in order to get the forearm almost behind the bass and as horisontal angle as possible in regard to the strings. He hasn't reported any RSI as far as I can tell. I don't know anything about his fretting hand though, which must have taken quite some damage by now.
I don't think there's one angle fits all for each and every person, or even playing style. And picking with a pick, and doing funk with a lot of slaps, thumbs and pops actually do require different angles, and you can't really change that while you're playing live at a gig, maybe change basses with different strap lengths. Or playing a double neck bass, configured the same, but use the upper neck for thumb, funk, and the lower one neck for straightening out the picking plucking wrist whenever you go back to "regular" playing.
This works well for him:
Bass tucked underneath his armpit!!!!
And here, he just have to angle the wrist severely when plucking regularly:
As I said earlier with watching people writing with a pen, you'll go "oh, how can you hold a pen like that, don't you get cramped up and lactic acid!?!?!?" and then get the reply "no, but I would if I held it like you do..."
It has worked for him, and still does. Don't tell me that this angle would be "perfect" for regular finger picking just as well as it is for thumbing for all persons alike. Not anyone would convince me onto that. You can put a gun to my head, I won't ever agree with this. Remember one thing:
What's ergonomic for you, ain't ergonomic for me.
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