No,
This is what people are not understanding with Gain Twist barrels the other benefit I have found and what he is talking about in the videos is Bullet Weight.
Gain Twist barrels don't care about bullet weights the same as a standard rifle profile. As the video talks about 223 competition shooters, Service Rifle, in this case, use different weights as they move out to distance.
In my experience, and I have at least 6 barrels now, they dont care, My Prime Load zeros in exactly the same place as my 136gr custom load. You cannot tell the difference except at distance when the velocity and BC start to kick in.
The ease and accuracy of a gain twist should not be understated because not everyone can do it right, so they consider it a waste of time. not so, I have been specifically getting Gain Twist barrels for all my recent builds in the last year. It works and has very little downside.
The idea it was for heavier stuff is not true, smaller stuff can be spun wrong and come apart quickly because we tend to push them harder.