What makes a trait advantageous is very relative. Having a slow metabolism is usually bad, but if there's food shortage it becomes an advantageous trait. Dwarf

What makes a trait advantageous is very relative. Having a slow metabolism is usually bad, but if there's food shortage it becomes an advantageous trait. Dwarfism is similar. That's why larger/stronger/faster cats like the saber-toothed cats died and now we have smaller cats, for instance.