As built-in Dante has arrived with the “New QU”…
Built-in Dante on the SQ to, at least, “keep up with the Joneses”, leaving the expansion slot available for a second i/o card . OK, the price would have to increase to cover the licence from Audinate, but so much use in many install situations.
This is a hardware issue. If there was a built in Dante card slot (like there is on the Behringer Wing consoles) it would have been discovered already. This means that unless A&H “redesigns” the SQ lineup like they just did with the QU line, there isn’t any way to add built in dante.