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An all band rig at that price level isn't unprecedented; the uBitX
already does it. I expect the QSX to offer higher performance and thus
be a great rig. On the minus side, it probably won't have open source
firmware. (But I hope it will be designed for easier reflashing than
the QCX!) I'm definitely interested in building a QSX!

We are getting a lot of benefit from off-label uses of technology that
was developed for the computer industry. The Si5351A was designed as a
clock generator, not a VFO. The FST4253 was made as a switch for
various analog signals inside digital devices; using it as a mixer
wasn't even remotely the intent. But they work well, and at prices far
lower than chips that are actually designed for high performance radio
use (like various chips from Analog Devices).

I'm looking forward to the day when a chip designed for something else
lets us build an inexpensive DDC/DUC SDR. That day is not yet upon us.
There is more than one way to build a high performance HF radio, and
it will be fun to be able to play with all of them and experience the
advantages and disadvantages of each.