Just for context - over the last 13 years, I developed professionally in PHP, Java, Scala and Python, together with some code in Go and Rust. I can patch C and C++ code. By saying professionally, I mean being paid to do it as a main job.
The integrated nature of Django (ORM, admin, migrations) is a killer, but very rare to see. Spring + Hibernate doesn't come even close. Play framework seems to go in this direction but misses a lot of stuff. Maybe it's matched in modern PHP or in Microsoft land but I don't have much experience there. You can collect all the components and tie them together, but you're focusing on assembling the tooling when you could be focusing on the real problem. Being able to develop alone or in a very small team means real agility and low overhead. The time to start matters very much.
I know Django has its own pain points (for me, it's mostly performance). Each part of the stack has a better alternative as a standalone library. But I'm willing to sacrifice using the top tools in favor of using the top stack. Most of the web apps have a core product that's unique, but otherwise they all need to deal with database, authentication, authorization, CRUD admin interface etc.