But in your example, the navigational technology, explorations/techniques which allowed the leap of sailing across the Atlantic were followed up on, built upon, and improved upon. There wasn't a 50 year lull while everything went back to the pre-1492 status quo.
They were also a monarchy and not subject to the political whims of a democracy putting in the opposing party who then cancelled future ship construction, so that shipyards convert to some other business, with many experienced shipbuilders taking jobs in other industries.
Analogies limp except in the point of comparison.
A) they lost all the reels of flight telemetry data (how convenient!)
B) They claim to have destroyed/lost the $175 billion in technology developed during the Apollo missions (Dubya-Tee-Eff?)
C) They speak of the Van Allen belts as being an insurmountable obstacle at present.
D) In the late 2010's NASA has gone on camera stating they look forward to exploring "beyond Low Earth Orbit for the first time."
E) A film reel shows the "astronauts" allegedly between the moon and earth, using camera tricks (a small hole in a screen over a window) to make the earth look tiny. They were just in Low Earth Orbit. If they truly went to the Moon, why resort to such deception?
These have been addressed. Several times. Especially that last one (E). It's utter nonsense, as far as I can tell originating from Sibrel. You can see that it's nonsense by looking at the full video before Sibrel's deceptive "editing". And you din't provide a source and quote for (D).
I( have patiently explained each of these things when they have appeared. But now we have the same people just repeating the same things, as if they have never been addressed either here or elsewhere on the internet. And while I was doing Sunday liturgy and family things, someone has apparently given me 23 downvotes in less than a day.