Has TAILS considered keystroke deanonymization?

I have been interested in contrasting TAILS and Qubes system properties and functions for a while now.

There doesn't seem to be keystroke anonymization in TAILS but Whonix WS in Qubes does.

Also, can anyone provide insight into the advantages of Xen virtualization in Qubes as opposed to libvirt and the access control strategy in TAILS?