More recently a project called ETHPrize conduced 100 user interviews with developers in the space which revealed a lot of valuable insights surrounding various problems. Check it out here: https://ethreport.info/
I am currently exploring similar problems surrounding designing for web3 products / blockchains (eg. designer education, onboarding, problem solving, workflow etc.).
If you have 30 mins to spare, I would really love to jump on call with you - my telegram is @pet3rpan
ps. If you are coming to ETH Berlin, Berlin Blockchain Week we can also meet there!