Confirmation bias is a person’s tendency to process information by looking for, or interpreting, information that is consistent with their existing beliefs.
www.britannica.com
confirmation bias, people’s tendency to process information by looking for, or interpreting, information that is consistent with their existing beliefs. This
biased approach to
decision making is largely unintentional, and it results in a person ignoring information that is inconsistent with their beliefs. These beliefs can include a person’s expectations in a given situation and their predictions about a particular outcome.
People are especially likely to process information to support their own beliefs when an issue is highly important or self-relevant.
This is what it comes down to here. Someone uses STA-BIL and wants to believe that they made the best choice, so any data that supports and confirms the validity of their choice is held up as prima facie evidence that they make good choices, at times regardless of the source.
We all do it to some extent or another whether it's recommending the same tractor, implement, truck, trailer, tv, washing machine or anything else that we own. If someone chooses a different model to one being recommended, it's often interpreted as an attack on the decision making process of the one who made the recommendation. We need to stop doing this.

It simply doesn't matter what other people do or buy or what they think about our own choices whether it's how we build something, maintain something, store something or whatever.
I've been using Stanadyne for decades but is it the best diesel additive? I have no idea, but if YouTube is your go to source for decision making you'll be left none the wiser when it comes to the "testing" of Stanadyne. I'm trying a different diesel additive at the moment based on the recommendation of someone who does seem to have some expertise when it comes to oil, fuel and additives. I have zero data to support either choice other than decades of trouble-free diesel equipped truck, tractor and generator ownership and that's just fine with me.