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I agree strongly on trackball being tiring on the thumb. In combination with smartphone use, it's far too much strain on this one joint.

As for straight wrists, I find that naturally happens for me as well, but my impression is that it's not great bc the torsion at the elbow can lead to RSI.

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I also don't experience any noticeable torsion at the elbow. Putting my hands in front of my chest is a perfectly relaxed posture for me. Typing is not that different from writing in terms of where my arms and hands are (other than the two-handedness).

That said, I do move around a lot instead of keeping my hands always on keyboard, so maybe that's why I don't experience the typical fatigue at joints associated with keyboard usage.

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