This really does not sound healthy. The game is released, for a certain amount of money. If people don’t like what they get for their money, they simply should not buy it.
But by now gamers have been so trained to expect to endless content treadmills and all their ilk like mtx and battle passes that publishers/developers get egged on if they don’t work on their game 24/7 and forever.
If someone complains about buying a finished game and not getting more of it later, they’re idiots and there’s nothing you can do but ignore them.
Publishers that do ultra-early access/roadmaps/live services with promises of content/bug fixes/trust me we’re making the rest of the game later, are clearly to blame for the mess too. They’re the ones poisoning the well.
But plenty of games release in a final state and that’s okay. They have to be firm about it though.
It’s a tough line to walk. You want to create reasonable hype and you have an idea where you want to go, but as you correctly point out, it’s really easy to over promise and under deliver.