It's funny you mention this. I use goggles for my Inspire 1. The goggles are directly connected to the HDMI port and give me full telemetry information. But, as you said, they don't give any warnings. I know for a fact that DJI apps have a lot to do with flight restrictions. What I haven't tried yet, which I'm sure will work, is to fly without an iPad and just the goggles. No iPad = no app. No app = no restrictions. It would be an interesting experiment.
I personally have hacked all the restrictions out of all my DJI drones and DJI apps, but I still get the warnings on the screen. It would be interesting to see if you could "head the restrictions off at the pass" by not even connecting an iPad.
Of course, you still need the iPad to clear the MicroSD card and set exposure and color space, etc. But one CAN control these things via the RC. You just don't get any user feedback like EV value. It would be an interesting experiment.
I use FatShark Dominator V3 goggles. I've had them for quite a few years now and still absolutely love them.
D