Can't you use the same criteria as GARMIN?
The G1000 is a full IFR naviagtor with IFR procedures. So it starts with that, which allows it to navigate all the way down to a runway. To see HITS, you need to program a procedure into it.
SkyView is not an IFR navigator. It can connect to one, and if you have one, then it can fly you to the runway. Without that, it has no idea about approaches, holds, etc.
The real question here is if people are asking for synthetic approach, or HITS. Synthetic approach is the creation of a virtual glideslope to any point, which is a flight planning tool that is independent of HITS. HITS is a display of whatever flight plan you have, but it can't magically create flight plans or approaches.
Today, if you don't have an external IFR navigator, HITS on SkyView would show you your flight plan, but the boxes would be at the altitude your altitude bug is at. It couldn't give you vertical commands. Is this what people expect?
As Mmarien says, HITS is just a different display of the flight director.