AR and photo redesign get lumped together as the same category and they are not remotely the same experience. One puts an object in front of you at true size. The other reimagines the whole scene. Knowing which problem you have saves you the wrong app.
AR earns its keep at the moment of a specific decision. You are standing at the nursery, or in your own yard, wondering whether that olive tree is going to look absurd next to the shed. Point the phone, drop it in, walk around it. Nothing else answers that as well, and no AI render answers it at all, because the render will happily draw a tree at whatever size makes the picture look nice.
Where it stops being enough is scope. iScape builds designs the way a person builds them: one element at a time, dragged in and positioned by you. A full backyard is dozens of those placements, and the result looks like objects sitting on your lawn, because that is what it is. The plants do not cast the right shadows, the paving does not sit into the ground, the whole thing reads as a mockup rather than a photograph.
There is also the matter of ideas. AR shows you your idea. It does not have any. If you do not already know that your space wants a Mediterranean treatment with gravel and olive and a low stone wall, AR will not suggest it, because it is a placement tool with a plant library, not a design engine.