As asked before, can you please provide some data on the nutritional value of silversides in comparison to other human food grade seafood? At this point, your only argument is because there are bones/guts in them, so it must be better. In that line of thought, I may believe that grapefruit are better for you than a kiwi fruit because I think the orange color looks better. However, testing will show the kiwi fruit to be extremely nutritious, and the grapefruit lacking in many ways.
Back to the fish, you can also coarse chop a variety of foods to give the nem more variety, so this may assist in additional nutrition. That is a hypothesis, as I do not have data on said issue.
I think your argument falls a little short of my logical ability, however. You have been feeding these silversides for months. We all know that food goes bad with time - yes, even in the freezer. It may only be a matter of time....left out on the counter one too many times, freezer door not closed fully and not noticing. There are many variables that can affect food quality.
Back to my previous example, I've been drinking this last gallon of milk for 10 days, so using your logic I should still be ok for a long time??? What I am trying to say, is that previous history is not always a true predictor for future experiences.
I agree fully that there are many opinions in this hobby, but dead nems from very experienced hobbiests with a direct positive correlation to feeding silversides is not an opinion, it is a fact. I'm not saying it will absolutely happen, but rather it is most definitely a risk.
I like the quote in your signature, maybe it applies in this situation, but use the word "my" as "our". We're all here to share and help, and are not trying to steer anyone wrong.