No, it does not "improve tone" , but what it does do is make it so the guitar can be repaired. But beyond that, the other major advantage that is will not "creep".
The advantages of a no creep glue can be subtle, or they can be huge.
The real "thing" about hide glue and other protein based/gelatin glues is that they are hydroscopic and will absorb and wick off moisture at very similar rates to the wood, therefore during expansion and contraction cycles the glue expands and contracts along with the wood, where other adhesives do not.
If extreme cycles happen with "regular" glue often times seems will start to show distortions, these can telegraph through finishes and show either valleys or peaks in glue seems as well as lead to distortions in areas that have constant load like the neck.
From a buisness/money making point of view hide glue is much more labor/time intensive as well as a minor amount of electricity that is used to keep a glue pot hot all day, and yes there is a "skill" that needs to be developed using it.
It must be applied correctly in a timely fashion or it will fail.
The other advantage of hide glue from a builders perspective is that hide glue comes in or can be made to be different strengths. From virtual epoxy like bond, to a weak temporary tack glue.
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