Extremes of most things are bad somehow, I guess.
But extremely low body fat is not something I personally have had to worry about!
(And I understand a bit of a reserve is good when fighting certain diseases, such as cancer.)
Yeah, most of us don’t need to worry about too little body fat.
The plus side is that fat does give you energy reserves if you come down with serious illness. But too much and you will likely be suffering from cardiovascular issues. Moderation in everything-