A guy has to remember his application and goals for accuracy that he needs.
Bullet pressure ring about .020 above the shoulder neck junction gives fantastic results in the 223, 223 AI, and 22/204. In fact, all of my zero freebore reamers in 223, 223 AI, 22/250, 22/250 AI, 6 BR, 6 Dasher, 6 BRX, 243, 243 AI, 6 Rem AI, 7 stw, 257 Weatherby all shoot groups that open up a single bullet hole.
Remember, bullet leade grows in length and diameter! So, if you start off with .020 freebore, 600 rounds down the bore, that freebore has grown, plan ahead for more useful barrel life.
I Quit shooting competition.
My 7 Mags with .110 freebore all seat the 140g-168g bullets into the shoulder area and all of them shoot dot size groups.
Truth is that it is just requiring way too much thinking/effort to ask a guy to monitor his brass for doughnuts....and that ain't no BS! Since most reloaders are not willing to monitor their shoulder/ neck junction for doughnuts, best to devise a methodology to keep them out of trouble.
NO one would believe the accuracy of the 7 STW and 257 Weatherby with zero freebores....no body.
There is a standard for competing for the ultimate in Accuracy in competition, and that standard should not be confused for Varmint Hunters and casual shooters, especially when barrels are running $600-$750, chambered.
Minimal freebore to meet your accuracy goal means more useful barrel life.