All due to the fact that the iPhone Xr does not have a second main camera, which allows you to take photos with amazing depth of field. If you want a portrait – no problem, taking photos of something else with a similar effect, alas, will not work.
It turns out that Apple provided portrait mode exclusively for faces.
Remembering Pixel 2 and Pixel 3, which also have a single module of the main camera, it is worth noting that Google smartphones have a very thought-out sensor that takes into account the depth of field. The iPhone Xr, apparently, has a much simpler sensor. [YouTube]