I'm not sure I agree with Adobe design suite being needed. I am a close to someone who's been through multiple different public sector institutions in my country and the only true constants is the cord Microsoft Office suite (Word+Excel+PowerPoint), Outlook and more recently Adobe Acrobat (mostly because of digital signing) and Microsoft Teams.
The core office suite is very good and people are very used to it. It also seems to be the hardest to truly replace, in my opinion.
LibreOffice and OnlyOffice are a good step forward but they're not replacements yet, for a lot of people, due to a simple fact (already mentioned somewhere here): people have been using this software for decades and are very used to the way they work, and replicating that, especially nicher things, is not trivial and takes a lot of work. Still, I'm hopeful.
Outlook, Acrobat and Teams may be easier to switch, particularly the last two. Outlook (and Exchange) has some extra nicities compared to plain standard email (from the top of my head, I recall read receipts and automatic responses for when you're away being important ones), but there are some nice projects tackling both the client and server side parts of those features.
Acrobat could maybe be replaced by a reader like Okular, given a bit more polish, and Teams is so bad and often used in such basic ways that it could trivially be replaced by something like Mattermost (though I personally much prefer Zulip's model).
Again, all this is based on my experience and certainly won't apply everywhere.