If you call it technical , it would be "because it forces everyone to use cssu-thumb". Which is based on cssu-testing, as opposed to cssu-stable.

That doesn't take into account - of course - that cssu-testing is de facto stable and everyone and their uncle uses it (if using CSSU at all), and cssu-stable is de facto "oldstable bits thrown randomly together", that no one is using (unless is wrongly informed, like, follow CSSU wiki :P).

Same apply for forcing to use custom kernel (kernel-power or cssu one, while the latter perform same function as cssu-stable - only misguided [ ] are using it, for everyone sane it is either KP or no custom kernel at all).

/Estel

// Edit
Whatever the method is, we *need* thumb repo. Chasing binaries from various threads is getting old.