You know the joke from "The Curious Incident of the Dog in the Night Time"?
"There are three men on a train. One of them is an economist and one of them is a logician and one of them is a mathematician. And they have just crossed the border into Scotland and they see a brown cow standing in a field from the window of the train (and the cow is standing parallel to the train). And the economist says, 'Look, the cows in Scotland are brown.' And the logician says, 'No. There are cows in Scotland of which at least one is brown.' And the mathematician says, 'No. There is at least one cow in Scotland, of which one side appears to be brown."
LCHF diets do work for some people, many of whom are gathered on this forum. It's not simply that the rest of the population just need to be told and that's their diabetes sorted out. There's no proof it works for anyone and everyone, or information as to what the difference is between people who can stick to it and those who can't. Nor is there good evidence that it doesn't cause other problems we don't know about yet as there haven't been enough long term studies.
We are each conducting our own badly-controlled experiments on ourselves - I'm trying the LCHF diet, but also mixing in a random amount of eating less and exercising more as I feel like it. That's not science. I'm not saying it doesn't work - I've lost about 11kg in 12 weeks and my BG is currently at normal levels and my BP is too without meds and currently I'm as happy as the OP is about those things, but it's a bit early to generalise - you would need firm guidelines on how much carb is too much or too little, what sort of supplements are recommended, what drugs should or can be taken alongside etc.