I am one of those strangely believing people.
While these stocks--and I have several--shoot well enough as is, they are indeed improved with bedding. The bedding blocks often are not straight and when the action screws are tightened then stress is introduced into the stock. That stress opens up groups.
Also, when the recoil lug is bedded where there is clearance at the bottom and front but it is solid against the sides and back, it helps minimize movement between the barreled action and stock, which also improves accuracy.
A good way to tell if there is stress in the bedding is to mount a dial indicator base on the barrel and preload the tip on the stock. Then, with the rifle held vertically, tighten and loosen the guard screws. There should be .002" movement or less, and the indicator should go back to the same reading when the stock is tightened.
Now again, when we only care about 1 to 1.5 MOA DG rifles, then none of this matters much. But if you want reasonably consistent 1/2 MOA at distance, it does make a difference.
The hunting rifles we build, whether I chamber them or the guy I trained chambers them, and we do the load development; we routinely get sub 1/2 MOA at 650 yds. And it's not just the rifles we build, any rifle built by a decent rifle-builder can be tuned to that level. We have developed loads for many.
The rifles I have built for myself to shoot in 1000 yd BR competitions have shot several screamer groups (<2.5" 5-shot groups, and < 5" 10-shot groups) and have won several aggs.
The key is to cut a straight throat in a decent barrel, have an stress-free bedding job that controls movement, and an action that is reasonably true. Sometimes we can get that in a B&C aluminum block stock, often not.