Why aren’t large-format digital camera sensors made with TFT flat-panel detector technology like medical X-ray panels?

While the resolution may or may not be enough for modern photography, resolution is not everything, and the technology would make a reasonable candidate for large format photographic image sensors. Why did that not happen so far?

I think you're being too generous to your argument, when you say resolution is not everything in regards to large format photography. The whole point of large format is to capture a high degree of detail (resolution).

Let's say we're talking about an 8×10 large format camera. With good film, you're looking at an equivalent resolution in the range of 800 MP, probably even more.

Even thought the flat panel detector (FPD) you linked to is 17×17, let's assume a smaller, 8×10 detector is also 10 megapixels. That 10 MP FPD is giving up an 80:1 advantage to film, or a spatial resolution of 9:1. To what end? Why go through the hassle of carrying and setting up an ultra-low-resolution imaging system, that can only produce results about the same as the front (selfie) camera in the smartphone in your pocket?

Put another way, for 8×10 large format photographers who already have the camera(s), lenses, etc., what advantage does such a low resolution imaging system give them?

Thus, ignoring other potential considerations, if this technology is representative of the current state of the art (at least at the price point), then the reason it hasn't happened so far is simply because the resolution is far behind what comparable film sizes can produce.