I just rolled up the most horrendous "habitable" planet ever.

[Varyon]

Originally Posted by Johnny1A.2

It isn't only ever false, though. Earth exists. It's the one definite True we know about, but it does exist.

Having the question "Is this planet habitable?" basically work out to be the same as the question "Is this planet Earth during the Holocene?" doesn't really accomplish much for you. Granted, a better question for the first one is "How habitable is this planet?" so that rather than a "Yes/No" answer you can have a range. A very habitable planet would be one where a person with minimal to no training could be dropped in naked and expected to thrive, this would progress into things being harder (needing more training and/or gear), eventually to the point of being largely indistinguishable from being a space habitat with more reliable gravity (and also progressing even further, with the habitat needing to be more resilient than a space habitat - like one in a gas giant or perhaps on a highly-volcanic planet).