After seeing so many posts on how Qubes can be changed I think it’s a good idea to focus on what works, i.e., please keep doing this.
Security is my number one reason to rely upon the protection provided by Qubes versus the privacy of Tails. Increasingly sophisticated attacks show it’s only a matter of time before my system is hacked, if not already. Besides some not-for-public-consumption operating systems Qubes is the only game in town providing this level of security and I hope it stays.
Debian available as a standard template is an outstanding choice. Pretty much any program I’ve used from calculators to mainframes is available on Debian in some form or another. And any OS you use has to do what you need. Debian also has the stability of a rock. Both big selling points. (I use unchanged Fedora templates for all system functions.)
XFCE works. I know that many would want to use what is familiar, such as GNOME or MacOS, but the simplicity and flow of XFCE is an excellent foundation for Qubes.
With that said, the KDE port unman released and its use of Activities may point to a future Qubes desktop. Qubes certainly demands a higher level of expertise than most, so seeing such movement towards a Qubes-unique OS may help bridge that gap.
Do I have any suggested changes? Sure, but that’s not the point of this post. I’ve read a lot of the items posted about the Qubes internals and its’ very bright Team ought to be proud of what they’re doing. Please keep it up!