I think the issue with diets is that they are diets and, as such, follow a schema of proscriptions, and we introduce the concept of 'cheating' and then there are cycles of guilt and recrimination for breaking those proscriptions. It's a fundamentally toxic approach to eating and weirds our relationship with food. Most diets ultimately fail.
Every diet comes with a few cherry-picked scientific papers as 'proof' and people do get very defensive when challenged, even in friendly debate. Honestly, if it works I'm happy for you, but there's a danger that for everyone it works for, there are lots of people it doesn't, and they're locked into a dieting cycle that furthers their poor relationship with what they eat and drink. For that reason, I remain a dietary sceptic (for any diet, keto- included, though I respect an individual's choices).