But yes, Portmeirion had a rich history before McGoohan decided that it was perfect for his idea. Noël Coward wrote Blithe Spirit while staying in the village. George Bernard Shaw, H.G. Wells, Gregory Peck and Ingrid Bergman were all visitors. Beatles Paul McCartney, George Harrison and their manager, Brian Epstein, were also regulars in the village.
I somewhat worry that the show is all atmosphere, no story. Like, is the writer really winging it at this point? We've certainly seen enough shows where that was the case. Premise with no payoff.
But perhaps I should just give up looking for various threads to be tied up — even stop looking for clear metaphors and just enjoy the ... vibe?
J. Michael Straczynski had a a storyline designed to last 5 seasons (and apparently with several "trap-doors" for when actors left the show etc.), but the studio then let him know that they were going to cancel it at the end of season 4, so he had to tie up the main plots quickly. However, the studio then decided to produce a fifth season, so Straczynski had to string together a whole season that he hadn't planned for.