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You can install the [python-is-python3][0] package on 20.04, which symlinks /usr/bin/python to python3.

[0]: https://packages.ubuntu.com/focal/python-is-python3

I saw that, but it's not the default setting. You can't just write a python script and expect it to work on Ubuntu without putting python3 in the shebang.

I think the python team decided to do it that way, in combination with various distro?

The python symlink is allowed to be python2 or python3. E.g. Archlinux has it point to py3, Void Linux allows the symlink to be configured by the user.

See https://www.python.org/dev/peps/pep-0394/ for details.

I guess it will break too many things, some of which may be out of control of Ubuntu.

apt-get install python-is-python3