They seem to care about the game being in bad state but they fail to even entertain the thought that the game would've been in the same bad state or worse even if Sega hadn't let people see the state of the game.
You should care too when a game is called the release version of the game and does not feel like it. That's misleading and it's within people's right to expect more because of it being called the release version.
You set your expectations of what release should be yourself, but by any actual solid definition release is when the developer calls it a release. The game is f2p and everyone could see for themselves whether it's enough for them to consider paying and how much. You weren't mislead if you immediately renewed every single subscription and bought a rappy pack at the release. You just realized that reality isn't always what you imagine it to be.
Also you make the assumption everyone has another game to play, what if you don't?
In hypothetical situation where you don't have a game to play at this time, and Sega delayed NGS to 2022, you would be left in an even worse situation. Game wouldn't magically have content in 2021 if Sega had delayed it to 2022, and the game wouldn't magically have more content in 2022 if 2021 hadn't been the release date, unless you want to count in delays to development caused by bug fixing.