Python is having a moment right now, between the AI ecosystem, Astral tooling and a huge talent pool. I think calling it the worst choice is a stretch :)

The real question is not raw speed. It's how fast you ship, how many users you need before performance matters and whether you actually own your stack. Most modern solutions push you toward third party auth. This gives you full self hosted auth out of the box.

Scale problems are good problems to have.