That's his way of selling things - if he can convince you there is a need, he's half way to selling you a solution. Worse yet, some of his solutions are down right dangerous.
I won't say things like that never happen, but I'd also say they are rare. Get the barrel, shoot it, and if it performs (as it likely will), great! If not, come back here with specifics about what you did and how it performed and likely as not the folks here will be able to help you tune things without spending a bunch on a supposed "solution".
Just a Shooter (and Encore owner)