Were Abandoned Monoliths Merely Bad Production Runs?

If the production of monoliths was fairly easy in ancient times, abandoned monoliths, such as the ones at Baalbek, might have been nothing more dramatic than bad production runs that were discarded in favor of starting over again.

The old monoliths were abandoned and ignored as the workers went on to cut new ones. Only many generations later, when gravity had increased and the rocks at Baalbeck had become much harder, did the abandoned monoliths attract the attention and awe of visitors.

If so, there never was a dramatic change in gravity, nor a sudden hardening of rocks. The changes happened fairly slowly, over generations, as evident at Göbekli Tepe.