I'm not sure if you are also a strong supporter of the constitution, but it is part of it.
Secondly, as mentioned above, the history of humanity is made of migrating populations, there are no "pure",as some likes to define.
Denying new born that right is simply denying reality.

you are in someone's else land.

pas personnellement mais deux clients l'utilisent, un en self hosted et leur offre managed , mail etc. Depuis qqs années.

la partie sharing, calendrier etc fonctionnent très bien pour ce que je voie.

la partie apps, pas testée

nextcloud?

also many times an actual reboot, not a shutdown+restart. Only reboot actually resets hardware etc in way too many os. shutdown uses fast sleep/wakeup and all that crap lol