The point folks are making is that Stardew was finished on release, it’s just that the developer has the passion and financial ability to continue to improve it.
If it was 1994, maybe the game would have been released on a cartridge and never changed for myriad reasons (publishing rights, being on physical media, etc).
Example: Super Metroid was one of the best games ever made, and was complete when it was released, but you better believe I’d take free updates that further improve on it. There’s always improvements to make, because nothing can really be perfect. Those hypothetical updates wouldn’t retroactively make it an incomplete game. Maybe it’s too a subtle philosophical point
Oni was so much fun: I would love to see how it feels now, but my nostalgia for it is off the charts. Martial art combos, plus sci fi guns: there’s just nothing else like it out there, which is a bummer.