I guess I wasn't being specific as to where it applies/covers.
The last paragraph regarding, "Online games should have a better moderation support than this." is pretty much what is intended with the account system. At the same time it will also be tricky too, because they'd still need to figure out a way to review the matches people had for them to see what happened, what offenses were made, and then decide what form of punishment is suitable for said offense.
Then to add on to that, the account system allows for adding of friends, basically if you meet good people like you mentioned, you can add them so if you guys need to change lobbies it's easier to find each other. The game is mostly aimed at people playing with friends rather than randoms. Even though majority would still end up in random public lobbies. That's pretty much the risk you're just going to have to bare with until this account system gets implemented and tools for moderation are added to it as well. And I'm really happy they are working on it as well. Now that they have the Henry Stickmin game out of the way and pretty much abandoned other game ideas to fully give it their all to get Among Us to where they'd love it to be. I believe there's still hope to resolve these issues. And I look forward to seeing what happens next.
Now regarding the fix for ban/kick mid-game. It can easily be abused if the host can perform this action any time during the game, I don't know if you took this to consideration. BUT if you are playing with friends and there's people who are being an issue it only requires 3 people to kick unwanted people mid-game during a meeting. These features were added specifically for these kind of issues. But I understand being a ghost this isn't possible. So it's best to get them out while you're alive.
Another thing you probably never knew as to why account system nor in-game moderation was never an idea was due to the fact that initially Among us was never designed to be an online game, only a local game to played with friends in real life. So there was no need for these to begin with. But, down the line things changed (for the better) and online support was added for people to play with other people around the world. By the time they got this far, and due to how small the player base was, again this wasn't that big of an issue compared to what it is now.
So yeah a lot of you new Among Us players aren't really aware of the history of this game and as to why it is the way it is right now. It's totally understandable. And hopefully you can also see things from the developers side as to how they ended up with what we have in the game right now. Things have changed so much and so fast especially after how the player-base/community had be stagnant for so long. I expect it to be some what overwhelming, especially since they only have 1 developer that works on the back end of the game (coding/programing). There's a lot on their plate right now. And I totally understand the issues you and many many other fans are having. It's very much relatable.