None of the problems with building a utopia are technological, all of the problems are social and political. What the people arguing with you are telling you is that if you ignore the social and political problems, you're going to continue to create exactly the same kinds of problems that have been caused by every other attempt to solve social and political problems with technology. When you can figure out why people in the richest country on earth lack access to health care and food, neither of which are currently limited by actual abundance or availability, we can start talking about whatever other material things you think we need to live in paradise.

“We” can’t even effectively distribute food, healthcare and housing yet but yeah I’m sure capital will totally figure it out if we build enough machines that just accumulate more wealth to the richest people in history. I love cool new tech but I’m perfectly aware it will not do shit to solve any problem other than “eliminate or make labor cheaper”