I use this command and change every usage of BS (case in point
https://gerrit.wikimedia.org/r/#/c/83372/4/reflinks.py)
grep "(?:from|import) BeautifulSoup" ~/compat-git/*.py
you can do it and see
As I said on my last reply there could be other scripts from bot owners which use bs
directly and not via wikipedia/pywikibot module. I suggest waiting for additional opinions
before merging to the repo.
Greetings
xqt