“Germany has strictly standardised its digital document requirements. The Deutschland-Stack (in Deutsch), the country’s new sovereign digital infrastructure framework, names just two document formats that public administrations are allowed to use: ODF and PDF/UA.”
When public administrations run on proprietary document formats, they end up dependent on the vendor that controls those formats, with no real way out without significant disruption and cost.
This would help Germany ensure they could switch between various open standard office suites without losing access to their documents in future. This gives freedom of choice and more competition in the market.