Hi DeeToby
You don’t have to restrict your carbs to less than 50g per day.
The BSD makes the whole thing simple by not referring to carb targets, merely advising cutting out refined carbs. This makes it very easy to follow for those who don’t want to get into more than checking calories (or following a programme of recipes).
However the BSD does make the point that full fat, and eating a little more fat than we have all been told is good for us over recent years, is not a problem.
Some people here experiment with lower carbs and this does indeed suit some people.
The Atkins diet is rather more restrictive, and you will also find people discussing what is the best balance of protein. I don’t think that simply reducing the (good) carbs on the BSD, if people like to try this for both health and weight-loss reasons, is a problem.
If you find more carbs suit you, that’s great. It is evident from the literature that some people tolerate carbohydrates better than others and are able to maintain healthy blood sugars on 100-150g per day. Others seem to fare better on lower amounts.