> In my opinion this project is the best effort so far to have a full Office365 open-source alternative.

Then the effort sucks.

From my perspective as a German, this almost looks like a scam. It's a bunch of OSS software rebundled as a package by a company which would like to make money off of support for the software. Which inherently sounds great, except that their only original contribution to the software package is a mid tier project management app.

The vibe I've been getting so far, is that they're trying to resell OSS software and accompanied support, except the underlying software already has great community and commercial support (Nextcloud and Collabora for example) and to make up for that, they're getting the german government to slap a "Made in Germany" label onto the package.