LibreOffice

That's a whole lot of opinions just to say 'hey, you forgot these office suites were EU and existed for quite a while so we think the terminology you're using is confusing, and we don't agree about using that format as a default'. Seems pretty straight forward and I think I agree. Implementing a popup explaining and then presenting the choice for formats might be a cool middle ground.

But EU-Office is not trying to do a hostile takeover of LibreOffice as far as I know, and having a well maintained fork could lead to mutual benefits. I don't really get the hostility, if it's FOSS, it's FOSS.

Back in the land of reality governments have decades of office documents Ina proprietary format that need to be delt with so any office suite at least in the beginning need to access to them as written.

Why is "digital sovereignty" the current buzzword? That word can clearly mean both good things and bad things. It's a good thing when it means giving people and organizations control over their own computing (instead of some cloud provider or proprietary software company).

But there's no inherent value in insisting on "European software"; proprietary software doesn't become any better because it was developed in Europe, nor is free software bad because it wasn't developed in Europe.

The term can even mean things I would consider bad, such as: extending the application of laws to foreign entities on the Internet, which usually leads to censorship. I certainly don't want digital sovereignty like the People's Republic of China does it!