Tom Welling admits that Smallville became "far-fetched" to delay Clark's heroic transformation
"Each time we got picked up [for a new season] we had to push that finish line further away, and I think we had some low moments when we got too far-fetched," he admitted
"If you look at the series, the first five years were one show and the next five were a different show," he said. "We could have called [the last five seasons] Metropolis."
https://www.digitalspy.com/tv/ustv/a318924/smallville-star-regrets-low-moments/