People think speed is the only advantage, reducing runtime debugging and providing a more secure, more correct front end, free null pointer issues and free of memory leaks and runtime type errors - rust just has the added bonus of being fast.
You're right some of the tools aren't quite there and if you move a rails-y app over to rust, you have a job ahead of you to assemble some libraries, but it is doable - the point is that you can put rust in production at web scale now.
Not sure I personally feel comfortable building my own authentication modules. The rocket example was similar to one I did in flask but with flask I didn’t feel like I was creating my own auth. Rocket guards and JWT left me feeling like it was much easier to make a huge mistake.
Rails doesn't even have it's own authentication built in?
Seems laravel, might be closer to django, and with jetstream - it has an admin area baked in, which others don't.
Laravel is also just as, if not more performant (if you mix in swoole).