I would like to first inform you that I am being vague with specifics intentionally to protect myself, as I am aware that some of my coworkers browse Workplace Stack.
My superior often goes to one of my coworkers, a man who has been in the field for very many years, for a second opinion on various technical issues. It is almost always the case that his opinion determines my superior's decision, as my superior is not very familiar with this field. Part of my job is to identify errors/inefficiency and flag them accordingly.
I raised a problem to my superior and naturally they approached my coworker, who felt it to be not problematic because X reasons. But I feel I must first provide some context for your understanding.
The field that I work in is constantly changing, and although my coworker has been in the field for several years, I feel that sometimes his opinions are based on experiences from many years ago that may not be so relevant nowadays. I have been in the field for about 5 years and am a lot more 'fresh' than he is, and I keep up to date in the field much more regularly than he does, as another part of my job is to be very up-to-date in this field. His job is slightly different and does not require this.
Because of this, I know irrefutably that the issue I flagged IS a problem, and have hard evidence that the reasons that my coworker provided are no longer valid nowadays, but used to be the case maybe 10-15 years ago.
My superior dismissed my flagging with a 'my decision is final' tone, which I was not too pleased with, considering the fact that I know that he is making the wrong decision.
Whilst this problem is not company-crippling by any means, it would damage the reputation of the company over time if left unchecked, as it'll make us look outdated.
Should I raise this with my superior, providing the evidence that I have of my coworker's input being outdated, despite him giving me a clear 'my decision is final' tone?
I am not too good with dealing with workplace politics because I tend to be blunt in my responses, so please feel free to critique what I am thinking of sending my superior (roughly).
I understand that coworker is highly experienced in the field, and respect that. However, his reasons for this being a non-problem are no longer valid, though they would have been many years ago. I've attached below a document that demonstrates how this is the case.
Your decision is of course final, but as a loyal employee of this company, I would want for company decisions to be as well-informed as possible before coming to a final decision.