GE have imposed a max height of 70cm on a shelter made with eVent.
The idea is that most would not attempt to cook under that. My impression is that it would discourage all but hard-core (experienced) hiker/climbers from buying it.
Hence the official height of the Rab Summit Extreme is 70cm (about 86cm in reality)
One full sized 2 person tent made with eVent that is still available is the Exped Polaris. Officially the fabric is called something else, but it is eVent.
Franco