SInce I have been doing what you are asking about for a long time now I agree 100% with the concept. I am not in the business so have have nothing to gain telling you to build several guns.
1. No expensive tools required to switch barrels or bolt heads.
2. No time to wait for a gunsmith to work your gun in.
3. No gunsmithing expense to change barrels or making your whatever a switch barrel gun.
4. Takes minutes to change a barrel and a few more minutes to change the bolthead.
5. Super accurate pre-made ready to shoot barrels nearly everywhere.
6. Savage factory barrels nearly without exception are super accurate so one can purchase these factory barrels for nothing to whatever you are willing to pay. I usually pay $45. and one of my most accurate factory barrels shoots(300RUM) right in the class with my custom 6BR barrel.
The only down side to a Savage switch barrel setup is," you are taking money out of a smiths hand". I have a number of actions that will never have their barrels removed because they are super shooters and are designated for a specific purpose. I have other actions I switch from 375 RUM during bear season to 17-22 calibers for the upcoming winter fox season. I own no Savage that shoots over .5 regardless of setup or how many times I switch barrels.
7. Using one scope I simply write in my notebook how many clicks for elevation and windage each barrel takes when putting on different barrels. Sure having been hitting close to the mark for many years.
8. I modified stocks so that I can change barrels without removing the action from a stock.