I don't see anything wrong with not deep cleaning until you see the accuracy drop off but to never deep clean your bore is a bad idea, especially since most people that claim that they only oil their bore and put the rifle up probably don't even bother to oil the barrel. Most competition shooters don't deep clean their bores during their shooting season, they simply remove the carbon and oil the bore. But keep in mind that if you store your guns in humid, warm places (somewhere around 35% humidity and about 65 degrees F) then not cleaning the layers of fouling out of the bore will rust very quickly and that rust will turn to pitting just as quickly. I used to operate a gun range and I've seen many of those so called tack drivers that were never cleaned, most of them didn't really shoot as well as the owners claimed, most often the fact was that the shooter simply had no idea how well their rifle could shoot if had been taken care of. I had a guy with a Ruger No. 1 in 30-06 that his dad owned, it hadn't been cleaned in decades other than to run some Hoppes #9 through it once in a while. One day he complained that the bore was shot out, I looked down the bore and it barely had any indication of rifling. Knowing the story behind the rifle I offered to clean it before he replaced the barrel and he agreed. After a solid week of cleaning the rifle I returned it to the owner. After his shooting session he complained that I was going to cost him money because the rifle was shooting so well that he now needed a scope for it.