I will admit, for one of my writing ideas, it’s basically this. But, I set a rule that, while there are a very small list of certain kinds of artifacts left behind, most of what this race had was completely destroyed or lost; meaning they only exist as a tragic story about how nothing is permanent. Hopefully it’s an inventive take.

My way of doing it is “Its 3000 years in the future, planet colony, but its themed. You can still get amazing healthcare, but ordinary civilians are only supposed to use fantasy tech. Also every person can decide to leave and return at any time.”