God, I love it when people who clearly have personal experience or expert knowledge on certain things write obscure AUs that incorporate those things so hyperspecifically that I feel like I'm learning something.

I love nurses who write hospital AUs that have accurate medical knowledge just thrown in there because they went to medical school and when people who clearly had a phase where they obsessed over a certain time period write an AU set in that time period or location it's just so fun.

Tell me about the 1950s Chicago culture and history and how the characters are interracial and how that affects their life, I love when the money is accurately converted and the personal histories of the characters are thoughtfully woven to incorporate the new setting they're put in, I love it when people care so much about making something and use their own expertise to aide them.