What a great question Benjamin! “Why should a longtermist EA work on boosting economic growth? ” Is something I have been thinking about myself (my username gives it away...).
One quick comment on this “I agree Progress Studies itself is far more neglected than general work to boost economic growth”
This spurs a question for me. How is Progress Studies different from people working on Economic Growth?
One quick addition is that I see Progress Studies as innovation into how to do innovation, so it’s a double market failure :)