I wonder whether we still need a dev section for the pyproject toml.

Mostly, we expect people to install imod-python from conda-forge (or get it via Deltaforge). In that case, the whole pyproject dependencies aren't relevant, since it's the recipe that defines the dependencies.

However, we also release imod python on PyPI and there are people who do not use conda-forge (for whatever reason). For this reason, we've tried to keep a "minimal" version installable via pip, which is why we have the current required dependencies:

dependencies = [
    'pandas',
    'numba',
    'numba_celltree',
    'numpy',
    'pooch',
    'scipy',
    'xarray',
]

The more problematic stuff is things like netCDF4, GDAL, PROJ, etc. For this, the idea is that they're optional dependencies. They are available via optional-dependencies all, which should result in the same packages as the conda-forge install.

For stuff that only developers need (sphinx, etc.), the dev deps are separate. However, since we expect/recommend to use pixi now, we might as well get rid of it?