Thanks for clarifying! I hope you don't mind me asking since you've already helped, but do you know if Xenocara isolates app input from other apps a-la Wayland?
I know they do some cool stuff to harden X but I've never been clear whether isolation is included.
Sadly, I can't answer that. I'd check the docs at openbsd.org and search the mailing list archives (https://www.openbsd.org/mail.html).