[poincaredisk]

You link says the opposite - the change was very annoying for people that use non-english languages (like me), and:

>By default, qvm-copy and similar tools will use this less restrictive service (qubes.Filecopy +allow-all-names) whenever they detect any files that would be have been blocked by the more restrictive service

Also it looks like this is just for filenames? I can't imagine filtering text like this, that would render the system useless for me.

[fsflover]

The defense of the host (dom0) from the websites comes from not showing the UTF-8 window titles (https://www.qubes-os.org/doc/config-files/#gui-and-audio-con...). Since all you see inside VMs is isolated, you can show any text inside them safely for dom0.

It gets a bit harder with transferring files between VMs as my original link shows, but you can be protected from that too at some cost.