> Especially OnlyOffice looks extremely similar to MS Office, I have it on all our Linux laptops at home so the kids don't feel much difference between home and school envs.

This is how you make them dependent on a single MS-like interface. Kids are the most flexible, and shouldn't need. Would go as far as to say they are mildly harmed by not being exposed to different workflows.

Sure glad no one paved Windows over our Macs and Amigas so we wouldn't have to learn anything else.

OnlyOffice had some controversy around being owned and operated by a Russian company through shell companies. They might even fall under EU sanctions. There is an open German information request to the government that was never answered.

Wether those connections are true or not I can't say, but I do know people that dropped OnlyOffice in their evaluations for this reason.

I checked it, but at $149 per year for the home server (and don't forget to click in the 'information' button on the 'Lifetime' License Duration option), there seems to be a bit of a premium on that MS styling, considering the functionality in competing F/OSS suites.

OnlyOffice, Nextcloud OPffice, Collabora might all have free offerings to a degree, but you'll end up at the mercy of the companies behind those tools and OnlyOffice comes with Enterprise offering that does also cost money.

Costing money isn't necessarily bad, but it's also hard to beat free & libre.