Likely license/ device cost, complexity and migration costs. Most systems are desktop PC's with "Mobiles Arbeiten" still being a scarce resource in some agenci

Likely license/ device cost, complexity and migration costs. Most systems are desktop PC's with "Mobiles Arbeiten" still being a scarce resource in some agencies. (Constraints on laptops etc.). They chug along for 5-8 and sometimes longer if there's no requirement to upgrade. I wouldn't expect a laptop/ Tablet to have the same durability because it has consumable components like a battery. There's also complexity in such a one-off setup that makes hiring for admin people harder, places strong constraints on new systems and would enforce a strong dependence on Google and their cloud. While having a NAS or SharePoint is not fancy, it works and keeps pii local and not shared with your vendor. You might also have to look at integrating existing software (systems) into such an environment. This is likely not easy given that some systems are purpose built for government agencies environments.