The Purpose of The Land of The Lost?

I was always under the assumption that the builders had been Enik's people (the Altrusians), and that they didnt become extinct - war had sunk their race into barbarism, eventually evolving into the simple Sleestak.

David Gerrold once said that the LotL acted as a "cosmic way station" constructed by the Altrusians for beings travelling via the dimensional doorways. So presumably one intentionally entered a dimensional doorway from one's own time and place to get to Altrusia. From there, another portal could be opened to go to another time and place.

With the collapse of the Altrusian civilization, the entire system went haywire since the Sleestak no longer had the knowledge to use - much less maintain - the pylons and matrix tables. Enik at least had knowledge of how to use the equipment, but the dimensional doorways were glitchy to say the least (best exemplified by the Marshalls' paradox as seen in the Circle episode). S'latch also seemed to have inherited this knowledge through some freak genetics, but his fate was unknown. The Skulls in the Library of Skulls were also a conduit for the ancient knowledge of the Altrusians, but unfortunately the Sleestak often asked the wrong questions or misinterpreted the information presented (it didn't help that the Skulls often answered in riddles).