Most of Flask's heavy lifting is done by Werkzeug, which had its last PyPi release a month ago. I use Werkzeug directly rather than Flask, so I can't speak to

Most of Flask's heavy lifting is done by Werkzeug, which had its last PyPi release a month ago. I use Werkzeug directly rather than Flask, so I can't speak to whether Flask is abandonware or not, but I'm very happy with Werkzeug. With very little effort, I get to build just enough framework for my application, without having to be shoehorned into someone else's tradeoffs.