I was not aware of zipapp ... but it's interesting to see it exists as a method for enabling python to run 'zipped packages' ... since python can already do that by default with normal zipfiles, as long as the zipfile appears / is added to the python path (which is roughly analogous to how one can add .jar files to the classpath in java). E.g.:

  export PYTHONPATH="package.zip"
  python3 -m packagename

will work just fine.

(PS. I document this technique in one of my python-template projects: https://git.sr.ht/~tpapastylianou/python-self-contained-runn...)

I suppose, if the intent is to package something in a manner that attempts to make it newbie-proof, then requiring a PYTHONPATH incantation before the python part might be one step too far ... but then again, one could argue the same about people not quite knowing what to do with a .pyz file and getting stuck.