You are misunderstanding what ketones are and do.

You have glucose in your body at all times. This is a non-starter argument. Your brain needs glucose.

If you do not have enough glucose in your body, your body synthesizes it via gluconeogenesis from protein.

Excess protein (read: grossly improper macros) can actually kick you out of ketosis because your body will synthesize too much of it.

Ketones also aren't strictly "better" on their own. Sugar in excess is simply bad for you, but the key is "excess".

Ultimately ketosis is a newfangled diet that has a ton of benefits, but it is not -- and has not been -- the norm for basically the entirety of civilization. There have always been source of sugars in our foods.

Where keto wins is escaping a lot of the excess sugars in our foods, because all of that excess sugar makes us hungry, sore from inflammation and lethargic -- more than likely a function of the insulin release than sugar itself.

But it should not be mistaken for ketones themselves being better than glucose, because your body simply needs a certain amount of glucose and it creates it whether you want it to or not.