Why does stock mokee camera app (snap) have restrictions to use eis with 4k and 1080@60?

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I found that there is a restriction of using eis with 60 fps and 4k. Why do that?
I also use a los camera from los 15.1 (which is almost the same) and modified it a bit.
Comparing with mokee snap, los camera can see aux camera, use eis with 4k and 1080@60, use unprocessed audio source (camcorder sousce is awful), increased video bitrate.

ask qualcomm

Why devs don’t take off those restrictions?