For a GPS-Galileo receiver (2004 US-EU agreement), I think that a long term, time scale offset accuracy must be observed for a given location, which is somehow dependent from number of Galileo satellites. Keep in mind that the method would requires calibration trials not only with Javad receivers, but also with third-party ones, for tuning and assess the level of uncertainty in their time scale offset estimations.

Now, where on Earth did we have at least 6 Galileo sats in the sky all day long, to help a GNSS manufacturer estimate time scale offset between GPS and Galileo? Anyway, if I've got it right, Galileo started to broadcasts GPS-Galileo time offset in its signals, for a better contribution to GPS-Galileo interoperability.

So one could ask, what was (and still is, until 2019) the role of GATE for European institutes/companies since 2008, other then refining of all kind of GNSS data content, especially for a GPS-Galileo scenario, inclusive the development of a reliable GNSS receiver firmware for US/EU big companies. As we can see, their motto for companies and research institutes is: "Test your products and applications today with GATE to be ready for Galileo tomorrow". Since 2008.

I'm not worry about Galileo and I'm not worry if my explanation is partial or maybe wrong. Good things will surely come soon, just (probably) need more operational Galileo sats in the sky for more calibration trials and personally, I consider an excellent growth for a company like Javad GNSS, since 2007.