Just because it's hard to define the lines between inorganic life, simple life, and sentient life, it doesn't mean there's no distinction.
https://en.wikipedia.org/wiki/Continuum_fallacy
... and prescient life. Don't forget the next stage on from sentience. The line between sentience and prescience also seems blurred, given how many humans nowadays report having flashes of the future.
Just because it's hard to define the lines between inorganic life, simple life, and sentient life, it doesn't mean there's no distinction.
https://en.wikipedia.org/wiki/Continuum_fallacy