Why the heck would I want a kilobucks 6KHz VNA to debug my EPS32 based IOT doorbell?
Yep - nearly all consumer IOT devices are just buying off-the-shelf modules and antennas and never consider doing a single test. Kinda funny.
Anyway - as for USB controllers - there are plenty out there for reasonable prices for music makers. Check out "Novation Launch Control", for example. The problem is, some code would need to be written to map their outputs to the inputs of the VNA/oscilloscope/whatever.
totally - there are piles of really cool and useful USB controllers - just none configured for T&M USB based gear. A little code and some general purpose controller to a USB test box would go a LONG way toward making them very useful.
For anyone curious about pricing: "$9,000 US MSRP for a 3 GHz instrument and $12,000 for a 6 GHz instrument"
It looks like it is still cheaper to buy a used boat anchor off eBay for the non-space-constrained hobbyist.
This box is clearly designed for professionals and $12k is rather fantastic for a brand new 6 Ghz 2 port VNA (assuming the software and speed are good). I have been looking at the old VNAs for professional use - but get really nervous about supporting an old OS, unsupported platform, lack of calibration, spinning hard drives, no USB, monochrome displays, lack of modern analysis features, cumbersome cal procedures, etc, etc. Like many USB effort before, the software will make or break this product, but like the RSA series, it will get constant updates.
As for the size and portability - that is a huge bonus on a modern bench. You can move it around based on what you need to test (including taking it in the field). The boat anchor VNA's practically need a dedicated workstation that you bring the DUT to.