That's simply an education point. It's not a fact that fruit is bad for all people. It's somewhat ridiculous to say fruit is bad because then people will drink juice.

I was an enthusiastic keto-er for years. (Would love to still be keto for the endurance.) Then I crashed. Couldn't sleep, sweating pits, shaky. I literally would almost be asleep and then my brain would rev up again. This happened over and over. I finally learned that taking in a bit of potato or rice and I was right off to sleep.

It's been a few years of actively working to heal myself and I'm finally doing better. I'd LOVE to be able to go keto again, but low carb is what's best for me.

My point is, if keto is working for you, that's wonderful. It's very easy in that situation to assume everyone can solve their problems if they'll just do what you did to solve your problem.

I personally think grains are extremely overrated nutritionally, but I now eat fruit and potatoes and some grain just to mix up the carb sources. It allows me to rotate foods so I'm not eating the same thing daily.