Not sure about goverment requirements, but many apps I use nowadays are on the web, Figma, Canva, google docs, outlook and so on. There is not much need for a dedicated OS for most users.

the browser is definitely becoming more OS-like. that’s the Chromebook bet. but for proper office work you need good file management. if they’re not keen on trusting cloudy solutions by the big corps then FOSS on bare metal is the way to go.

SAP, Oracle, weird Office macros from decades ago …