Docs and Drive aren't the only products in this suite: they also provide alternative for Meet, Chat, GMail or Sheets. I have no doubt that Microsoft and Google products offer more features but my point still stands: a lot of employees (like myself) need productivity tools but only need the core features.
[1] https://lasuite.numerique.gouv.fr/produits/fichiers
[2] https://en.wikipedia.org/wiki/OpenDesk
[3] https://github.com/suitenumerique/drive/blob/46c9730d1b6d5c4...
Even though many formal processes still require printable PDFs, we are slowly migrating to something paperless, or at least not paper-centric.
Google docs is still great when you need to make something you mean to print, it just tends to not be that often anymore.
I even use markdown shortcuts to format in google docs nowadays.