installation fails because of PEP517

While installing hivemind on Ubuntu 20.04 LTS in a way that's listed in the docs: python3 -m pip install --no-cache-dir --verbose --user -e .[dev]

(btw why [dev]? that's not something I'd expect for prod env)

I'm getting:

  Running setup.py develop for hivemind
    Running command /usr/bin/python3 -c 'import sys, setuptools, tokenize; sys.argv[0] = '"'"'/home/hive/hivemind/setup.py'"'"'; __file__='"'"'/home/hive/hivemind/setup.py'"'"';f=getattr(tokenize, '"'"'open'"'"', open)(__file__);code=f.read().replace('"'"'\r\n'"'"', '"'"'\n'"'"');f.close();exec(compile(code, __file__, '"'"'exec'"'"'))' develop --no-deps --user --prefix=
    running develop
    WARNING: The user site-packages directory is disabled.
    error: can't create or remove files in install directory

    The following error occurred while trying to add or remove files in the
    installation directory:

        [Errno 13] Permission denied: '/usr/local/lib/python3.8/dist-packages/test-easy-install-23138.write-test'

    The installation directory you specified (via --install-dir, --prefix, or
    the distutils default setting) was:

        /usr/local/lib/python3.8/dist-packages/

    Perhaps your account does not have write access to this directory?  If the
    installation directory is a system-owned directory, you may need to sign in
    as the administrator or "root" account.  If you do not have administrative
    access to this machine, you may wish to choose a different installation
    directory, preferably one that is listed in your PYTHONPATH environment
    variable.

    For information on other options, you may wish to consult the
    documentation at:

      https://setuptools.readthedocs.io/en/latest/easy_install.html

    Please make the appropriate changes for your system and try again.

  Rolling back uninstall of hivemind

seems that PEP517 might be causing problems here, getting rid of pyproject.toml saves the day, but that's not a viable solution

See: https://github.com/pypa/pip/issues/7953

Python people were like:

_- We have a dozen of ways to install software and that might be confusing for sane people..._
_*thinking*_
_- Let's make another one!_