I have mostly been doing go microservices and react UIs but the complexity of microservices and writing our own code for things that are not in our core domain such as identity/authn/authz or writing code for various communication layers just to do simple CRUD makes development very slow and expensive.
So what would you choose for a modern productive web app stack?
On the other hand I've used Python/Flask in previous projects and that's nice because it's quick and easy. If you just want to write a few CRUD methods/endpoints that are a thin web veneer on top of your database, and it's for use by a small group of users, that's much more "productive". Quick to learn and start, and then you can add more functionality (like authentication) on incrementally when you need them.