I built/support a few #FastAPI applications in prod, my $0.02:
1. Focus on one explicit use case. No templates, no ORM, etc. so the surface area/ramp up much smaller than Django.
2. Defined happy paths, less analysis paralysis.
3. I personally feel that all-async is a little overblown, but others obviously don't. Plus, “the fastest x” is always good marketing.
4. Ride the AI boom.
TBH, I think #Django can learn from some of this. 😅