Getting back to the spoke torque wrench, it seems that it might be very useful for initial setting up, but a final spin on a wheel stand would be appropriate.
Which is what I've said, all along...
A torque wrench is a quick and easy way of applying more or less uniform torque values to any given set of objects - head bolts, spokes, whatever.
I don't consider a torque wrench to be the final step, it's merely the first step - and a very quick way to get to the next step...
which is to check the wheel for true, vertically and horizontally.
Truing a wheel is a very easy process and can be done on the motorcycle, in a pinch, but is also easy to do if you have a vice and a worktable. I use a bicycle stand.
I would also agree that individual spokes will react differently to the same torque value, based on age, rust, dirt, etc.
The trick is to get the wheel up into the "zone" where everything is more or less similar, and then tighten or loosen, where necessary, to bring the wheel into true.
The torque wrench is - in my opinion, based on my first use of this tool - an excellent shortcut to get you to the "zone".
I wouldn't consider myself an expert on motorcycle wheels. But there was a time where I did this for a living, on bicycle wheels - which are far more finicky, and need to be darn close to perfectly adjusted, on race bikes - or you will break spokes like a madman!