“People” often fancy themselves to be smarter than they are and capable of judging others wrong based on their limited information and passing knowledge, as well as what they have decided to be true rather than what is fact. Things like “because things were made of stone, all things were made of stone”, or “because some things survived the tests of time, all things were built better”.
It is exactly the bias that was pointed out by the commentor.
I highly, highly doubt that the ratio of durable to perishable baths, spas and jacuzzis is now higher or even similar to what it was back then. Will we ever know for sure ? No, of course not.
It is exactly the bias that was pointed out by the commentor.