It probably wouldn't work well for a small phone, by my oppo has a pop up camera which works much better than I'd expected.

Majority of the time I enjoy a full screen experience with a tiny bezel. If I need the selfie cam it silently and very quickly is there.

I think they didn't catch on as they are complicated and inhibit IP68 ratings.

But I think I'll struggle to move on from it. The notches and hole punch cameras just look like an irritating defect when I use them.