I don't like this, but to be fair, Europe's history has been very bloody. It's a continent that knows all too well what the consequences are for radicalization. With the recent suspicious deaths of several AfD political leaders in Germany, it seems that the political fight is being fiercely fought today. Could this be what ChatControl is really about?

It matters if you want to get hired for a job in sales, marketing, or business development. Or if impressing people from those departments is important for your job. Otherwise it's not important at all.

Good question. I don't know about other microkernels, but NetBSD is a small kernel that supports ZFS. The support has been there since the 4.0.5 and 5.3[0], possibly earlier too. I'm not adept at navigating the mailing lists here, but I imagine a good place to learn about the challenges of porting ZFS to a smaller kernel would be the NetBSD and ZFS lists from that era (2008-2009). What NetBSD does today is use a 'zfs' modlue that depends on a 'solaris' kernel modile. The dependency of Solaris primitives is probably one of the major challenges with porting ZFS to any kernel. FWIW, somehow a ZFS port for the "hybrid" kernel in Windows also exists[1].

[0] https://vermaden.wordpress.com/2022/03/25/zfs-compatibility/

[1] https://github.com/openzfsonwindows/openzfs

On the bright side, there's a good chance that Windows on ARM is not well supported by malware. There's a situation where you benefit from things being broken.