I’m worried app maintainers will start to indiscriminately run xattr -d no matter if the user actually wants that or not. There will not be any kind of standard way to do that so the experience will be very inconsistent between casks…
I hope Homebrew will start supporting hooks at a later point because it would allow users to automatically de-quarantine instead of having all maintainers add xattr -d garbage commands to all their casks.
Users will need to `brew install myorg/mytap/appname` instead of just `brew install appname`, but I think that's the only real option at this point.