flask dependency on Raspbian 10, very old version of werkzeug

[RANDOMLY-OBFUSCATED]

Hello,

The http server "python-werkeug" required by flask as a dependency¹ is version 0.14.1². Switching to bullseye would allow to use version 1.0.1 which is also quite old or version 2.0.2 provided by backports (python3-werkzeug).

• Can we switch to bullseye now?
• Is it possible to use the version for Python3?
• For Raspian, modifying the installation script to use pip3 instead of pip, good or bad idea?
• Is it really useful to take care of this?

Regards,

¹ apt-cache rdepends --installed python-werkzeug
    python-werkzeug
  Reverse Depends:
    python-flask`

² apt search python-werkzeug
  […]
    python-werkzeug/oldstable,now 0.14.1+dfsg1-4+deb10u1 […]