I never like to dismiss technology advancements "out of hand". For example, today's bullet offerings are so much better than when I started in the sporting sports. In addition, while I don't use factory ammo, today's factory ammo is far superior judging from my fellow shooters that shoot factory ammo, especially the premium grades.
If a bore scope aids one in obtaining their desired performance objective, then that is justification enough. I know I am in the minority, a dinosaur for another age but cleaning a rifle has never been a mystery to me if the measurement is performance on target.
During my time in the shooting sports and having made my fair share of mistakes and then some and having owned somewhere around 25 or so bolt-action rifles and having shot thousands of rounds cleaning has never been the issue relative to accuracy. For example, my Remington 700, heavy varmint rifle, 223 Rem, has over 3,000 rounds through it and still holds about 1/2 moa which is all I need for my purposes. This rifle has only been cleaned using a simple gun solvent such as Hoppe's 9 or Shooter's Choice since the late 90's albeit on a regular basis with a bronze brush.
In addition, I have never followed any of those prescribed break in procedures or used abrasives. However, being somewhat of a "herd animal" and always seeking some accuracy edge I began reading on the internet about all the bad things that can happen if one does not remove all the copper. So I briefly experimented with aggressive copper solvents. It created havoc with my rifles, causing clean barrel flyers and requiring several shots to re-establish consistent POI. Needless to say, I stopped that practice.