You are probably right. I have no experience with Nosler and there bedding jobs. I have had to re-bed several other factory rifles that have been bedded only at the recoil lug that shot terrible until the original bedding was removed and the action was bedded correctly both lug and tang and in some cases full action. I think it all depends on the factory stock. I think McMillan stocks has a few videos on how they bed their stocks to the action. I am glad to see you have good luck with your method and your factory bedded rifles meet your needs and expectations.It has been my experience in bedding hundreds of rifles, that bedding unsupported parts of the action is a waste of time and materials.
Do you think those Nosler guys don't know what they are doing, and just did a "good enough" bedding on this rifle? I don't think so. The OP says it shoots well, and why do you think that is so? It is because it was done right.