If you had just read it you would've seen this:
"Also, we know that forming groups and making friends is tough. Accounts and friends will be in Among Us 2 straight out of the gate."
Piwde
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A member registered Sep 20, 2020
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If you read the post you would realise that because of how the servers and matchmakers work that the game is really unstable, especially since it was made for mobile not PC. It's actually easier for them to make a totally new game than to add new things to Among Us 1, and it allows them to take a totally new start on the game.
Also just fyi this game was made by a team of about 3 people.