It really is that easy. Like mentioned you aren’t limited to a terminus but the Zeus does simplify it just one more level.
It’s so simple, loosen 2 set screws, apply anti-seize, thread barrel until shoulder contacts action, retighten set screws and shoot.
Impact, bighorn, arc, defiance, kelbly, ks, lone peak just to name a few all offer prefit capable actions. The only difference in the step is a barrel vice (can be had for pretty cheap), an action wrench (pretty cheap) 7/8 socket to fit the action wrench, torque wrench to fit the socket, and install action on barrel till shoulder contacts same as before, and torque do recommended settings.
Then of course the barrel nut or similar option which I have no experience with.
I use both action wrench’s and barre vise to install barrels on my custom actions as well as the Zeus QC. Both are awesome, both are simple the Zeus is just that much more simple.