Django should just not be used period. Fast API + Uvicorn is all you need these days. It does the async for you.
With LLMS, you shit out working production ready web apps in 2 days now that are quite performant, as long as you don't care about code maintainability long term.
FastAPI+Unicorn is good but it is barebones compared to what django already has. I can see why someone with experience in latter would not choose a new stack.
Also performance wise FastAPI + uvicorn have many pitfalls as well, most of them being of asyncio.