There will always be a demand for this level of quality. There is nothing wrong with their technique. It's just not to the tolerances I would expect for the same money spent elsewhere. The business end of a barrel threads and chamber are all hidden once it's put together. Even if you took it apart the threads and chamber look nice. Never said they wouldn't still shoot well. The barrels they build are excellent so they should still shoot way better than whatever you took off.
A factory fit job rarely possess these extra qualities:
Tennon threads on same plane as the bore path. When mounting a scope that is optically centered the windage sights in with zero to 2 clicks max. This is not a requirement but a mark of quality.
When threading the barrel to the action it turns in smooth and slop free right to the action. Once 2 threads are engaged the barrel has no more slop than one threaded most of the way on. A lot like a micrometer dial. This is not a requirement but a mark of quality.
A chamber square chamber to bore path defines as when viewed through a bore scope or from a casting every land is exactly the same distance to the neck of the brass. This means the bullet engages every land at exactly the same time. Production barrels range from 1/16" to 1/2" variance when measured this way. Even barrels with chambers oversized or crooked can still shoot 1/2 MOA and better. I just prefer the chamber is min spec and aligned to the bore path.
A no detectable burr throat that needs no more than a one shot break in. This is not a requirement but a mark of quality.
Precise sharp edged crown that is square to the bore rather than centered on the exit. This is not a requirement but a mark of quality.
None of this is needed or important in a hunting rifle but it's what you can expect from a specialist.
Here is your choice. A $14,000 Honda CBR1000RR or $120,000 MV Agusta F4CC. They both do about the same thing. I think the Agusta makes me feel special. In this case they both cost the same.