A lot of options are showing up for shouldered barrels which requires no gunsmiths to see the actions. Some of the newest actions being produced by companies are being held to such tight tolerances that a shouldered barrel can be made for them without a gunsmith ever seeing the action. For those that don't, the gunsmith has to see the action just once.
And it's just as easy to change out a shouldered barrel rifle as it is a Savage barrel nut one. I do it all the time. Every rifle is a "switch barrel" rifle. I really don't understand why people on here think it's so difficult to change out a shouldered barrel - seems to be a popular misconception.
Pre-fit barrels can be cheaper, especially when comparing the cheaper budget barrel brands to the premium barrel brands (which most pre-fits seem to be made from budget blanks). I will concede that. You are limited on contours with Savage threads, you have to use a hideous barrel nut, and a lot of stocks and chassis will require inletting work in order to accommodate the barrel nut.
With a shouldered barrel, I'm not limited to barrel manufacturer, barrel contour, I can have my gunsmith chamber it however I want (wildcats, chambers for specific bullets such as Berger 140 Hybrids, etc) - you have every option available with no limitations.
I'll take a shouldered barrel every time. That way I get exactly what I want (premium barrel blank, HV or MTU contour, custom chambering). And it's really simple to swap out barrels - really no more difficult or time consuming than a barrel nut style.