When I lived in Oak Park, there was a walking tour that went past our place. My family knew a couple people that lived in his houses. They all had major problems.
Brilliant artist, lousy engineer. Makes for not a very good architect, objectively speaking.
Personally, I think he was just ahead of his time. I’d be willing to bet he could have done amazing things with modern materials and techniques- But what he had to work with just wasn’t up to the task in a lot of cases.