Maybe because creating a touch-sensitive surface that can heat up to cooking temperatures without melting the electronics next to it is harder than it seems?
Just because something is in an After Effects mockup doesn't mean it's practical to engineer.
Is it? Electric hotplates (and, in particular induction ones), already exist and support somewhat similar placement of user interface, even if of a more bare-bones one.
I suspect the heater grid might be tricky or expensive, though.
Just because something is in an After Effects mockup doesn't mean it's practical to engineer.