Not surprising considering I haven't seen a programming manual or actual datasheet for these things in the first place. Usually helps if you tell the community how to interact with your hardware ..
Not even true: Arm, Intel, AMD, and most other hardware vendors (who are actively making an effort to support Linux on their parts) actually publish useful[^1] documentation.
edit: Also, not knocking the Qualcomm folks working on Linux here, just observing that the lack of hardware documentation doesn't exactly help reeling in contributors.
[^1]: Maybe in some cases not as useful as it could be when bringing up some OS on hardware, but certainly better than nothing