There are some factory barrels that truly excel. Have you had the chance to use any OEM barrels that made you think an aftermarket upgrade wasn’t even needed? I’d love to know which platforms you found them on!
I have never regretted changing a barrel, did 3 or4 on custom 1022 rifles, but haven't most of us, a very custom charger barrel, it cost more than the new gun, and my M1941 Marine Corps, I had bought a new barrel for my 1903 then desided to use it on the 1941 build. Every other firearm I own sports it's original. They all do what they are supposed to, that's good enough for me.