This is not an unreasonable question, I think. But here’s where I land on the issue.
First, ask yourself: what is the basis for this advice we have been given for decades? Is it founded in reliable research that we can trust? Look into this for yourself. You will not find that it is not. This alone calls everything into question.
Second, look to personal experience and the anecdotal evidence of many people who are reporting their own results with LCHF/keto.
I’m 55 and have been keto four years. I eat a lot of fat.
My HDL is up, Trigs are down, CRP (inflammation marker) is perfect, I weigh what I did in high school (165 lbs), I have tons of energy and feel great. If the fat is “bad” for me — whatever that means — there is absolutely nothing in my experience to indicate that. In fact, I have every imaginable reason to believe that my current diet is the optimal way for me. Furthermore, what would I do differently? Go back to eating the “recommended” ways? That way made me fatter and tired an unhealthy. No thanks.
Continue on the path and pay close attention to how you feel, as well as the other metabolic markers. Trust your body to tell you what it needs and what is working for it. I think there is an intelligence in the body that we can trust.