Comment by _heimdall

That goes in circles though.

Ignore the fact that we are human and thing our ingenuity is unique. Is definitionally linking human ingenuity and creativity useful when trying to compare to others?

I could say earth is habitable so any other planet must prove it is similar to earth to be habitable. That simply doesn't matter, though, if different environments could lead to similarly complex living systems regardless of atmospheric makeup, precense of liquid water, etc.

I'd argue the burden is on you to prove that the definition you propose is meaningful beyond our own hubris, rather than expecting an alternative to now have to prove that the hubris was unjustified.