It seems to me that there are very few examples of manufacturers advising not to pre-soak.

And a few examples of manufacturers indicating that a pre soak is "not required" or "not necessary".

And a further few examples of manufacturers being silent on the issue.

Correct me if I am wrong, but only the first means anything like "dont do it!".

I use a pre-soak unless told not to.

It keeps my replenished HC-110 a golden hue.