Why? Biological path is not about adaptability, its about ascention, like all another paths too. Adaptable, strong, clever, delicious (lol), and long lived. But why long lived, not immortal? Its seems illogical, because biology (gerontology) is shortest (just my opinion) way to immortality in real life. Give immortality to 2 of 3 paths and dont give it to biological path its fictitious limitation.
And this is not only one problem of the biological path. Biological path is really "blandness". The only one interesting feature is replaceable positive traits.