"Harvest Moon never moved to PC/Mac"

That's not the opening that Stardew took. It was only on PC because that's the platform that doesn't make you fill out an application to get dev hardware for.

The opening they took was Harvest Moon putting out increasingly uninnovative game after increasingly uninnovative game for years. Rune Factory innovated exactly once and then swore never to do so again (though they managed to produce RF4 so I do give them props for that. even if RF5 walked it so far back.)

Something about these games is very hard to pin down. See also: the millions of SDV clones, some even by huge players with lots of money, that don't make any kind of cultural dent.