A couple of thoughts:
Caffeine has been proven to improve performance in races, and it helps most runners focus during tougher points in a run. You may not want it, but the benefits outweigh the negatives (scientifically speaking). I am sensitive to caffeine, so rarely use it in running, but when I do its benefits are immediately apparent to me.
Keto diets, like any other diet, are not for everyone. For health or lifestyle reasons, we are all different. We all need to find our own balance.
Finally, for some people eliminating carbs and sugars from their diets would risk their health. If you don't want to consume these things, great. No one is asking you to do so. But to suggest that others try this type of extreme diet without consulting their doctor first could be risking their health.
So, we should all remember that we are all an experiment of one. I love the suggestions and ideas, but we all need to keep in mind that what may help us may not help - or, worse, it may harm - another.