Google is boosting AR performance on Android phones with dual cameras - The Verge

Mar 02, 2021

Notably, this means that the Pixel 5 and 4a 5G, both of which are 2020 Pixel phones with dual cameras, won’t see the benefits for now

That may be because their secondary cameras are ultrawides rather than the Pixel 4 and 4 XL’s telephotos, which would have implications for how they could produce more detailed depth maps

In any case, it’s another consequence of Google’s indecision on Pixel camera lenses