Flask turned 10 in 2020.
Unlike previous years, 2020 has seen major changes to the Python web framework ecosystem, with the release of a new Django version that provides significant async support, and the rise of FastAPI as a contender for the best Python microframework title.
As a result of this, Flask's popularity has taken a hit, at least in Europe, but I'd bet the US market is experiencing something similar. Django recently surpassed Flask as the Python web framework with the most stars on Github after struggling to keep up for years, and it currently has almost 1000 more stars. Both Django and FastAPI are growing faster in popularity, with FastAPI seeing some explosive growth.
It's hard to expect Flask itself to change as an answer to this. Its goal is to be minimal and stable, and it does that well. However, it seems that if Flask wants to still be a marketable technology in 3 or 4 years, it has to be improved in some way.
What do you think that Flask needs to still be a hot framework in the long run? In my opinion getting an async API would be a huge improvement.