Human relationships should be challenging. Refusing to be challenged by those around you is what creates the echo chambers we see online, where your own opinions get fed back to you, only reassuring you of what you already believe. These were created by AI recommendation algorithms whose only goal was to maximise engagement.
Why would an AI boyfriend or girlfriend be any different? They would not help you develop as a person, they would only exist to serve your desires, not to push you to improve who you are, not to teach you new perspectives, not to give you opportunities to bring others joy.
Post-scarcity does not exist. The more resources we have, the more we will demand, and no doubt AGI will create demand by existing.
The idea that having more than enough resources to go around means a world where poverty is eliminated is instantly falsifiable by the world we live in.
We know that people in developed countries suffer horribly in relative poverty, and I have no reason not to expect that further improvements to AI will vastly increase wealth inequality.