Several OEMs and DIYers have shared that soft silver is important to avoid the etched or bright quality sometimes attributed to silver. Annealing may be more significant than diminishing returns of 5-7 nines purity.
The better factory sources offer fine silver across a range of hardnesses. "Dead soft" silver implies full annealing. I suppose one could repeat the annealing process for incremental benefits or to restore softness, since silver tends to harden as it is worked. For this reason it is advisable to avoid excessive bending and twisting of silver cables.
Cryo treatment has goals unrelated to softness. No contradiction doing both.
The better factory sources offer fine silver across a range of hardnesses. "Dead soft" silver implies full annealing. I suppose one could repeat the annealing process for incremental benefits or to restore softness, since silver tends to harden as it is worked. For this reason it is advisable to avoid excessive bending and twisting of silver cables.
Cryo treatment has goals unrelated to softness. No contradiction doing both.