You can’t just imagine some utopia where nobody has to work, and everything is free, and call that communism.

Those are the anarchists (usually, definitions get fuzzy)

Most communists recognize the need for a transition state, we call that Socialism.

This isn't a utopia we're pitching, it's hard work, and there will always be controversy, and people will have to work, we will just work less, and we will strive toward working even less over time.

And that power will sooner or later be abused

There's LOTS of evidence that, right now, under capitalism, that abuse is veeeeery bad. We can learn the lessons of previous socialist attempts, but capitalism? That's shown to be corrupt and beyond repair.

As well, right now, under capitalism, your politicians are bought and paid for by capitalists. Power is already being abused beyond control. Under a socialist system, it would be illegal to donate to politicians. Political campaigns would run within a short, standardized window of time, with equal funding, and commercials would be illegal, it would just be a platform of ideas and opinions. The people would vote for the person who best represents them, normal people.

This exist in Cuba, right now. It's SO much harder to take power from a system that actually represents regular citizens, instead of a system that is bought and paid for by the highest bidder.