If it's this limited, then clearly it needs a lot more work. But using AR to see what your kitchen could look like with different designs is actually a cool and useful idea, assuming what you can see is in the ballpark of how it would look in real life. Hopefully they build this.
I haven't seen the app...
But I suspect you would be able to walk through the kitchen, look up/down/left/right, open cabinet/oven/refrigerator doors, quickly change cabinet styes and layouts from a library of available cabinets, choose flooring materials (tile/vinyl/etc. and change them), view and change granite/quartz counter/island tops, try different window options and treatments, try different choices for cooktop/oven/refrigerator/sinks/faucets, try different colors of wall/ceiling paint, chose/change kitchen lighting options, view and choose different tile backsplash options, etc, etc.
And most importantly, it would look and feel like you're really in and walking through the kitchen - as if you were really there.